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Defined Benefit Postretirement Plans and Defined Contribution Plan (Details 5) (USD $)
 12 Months Ended
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Preferred Stock [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Securities, Investment Objective [Domain]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Municipal Bonds [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Treasury Inflation-Protected Securities [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2013
United States Pension Plans of US Entity, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2012
United States Pension Plans of US Entity, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Preferred Stock [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Equity Securities, Investment Objective [Domain]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Treasury Inflation-Protected Securities [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2013
Foreign Pension Plans, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2012
Foreign Pension Plans, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2013
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Preferred Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Securities, Investment Objective [Domain]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Treasury Inflation-Protected Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Preferred Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Securities, Investment Objective [Domain]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Treasury Inflation-Protected Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Foreign Pension Plans, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Preferred Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Securities, Investment Objective [Domain]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Treasury Inflation-Protected Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Preferred Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Securities, Investment Objective [Domain]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Treasury Inflation-Protected Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Foreign Pension Plans, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Real Estate [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Real Estate [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
MRO Other investments [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
MRO Other investments [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Preferred Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Securities, Investment Objective [Domain]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Treasury Inflation-Protected Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
United States Pension Plans of US Entity, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Common Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Preferred Stock [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate Investment Trusts [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Securities, Investment Objective [Domain]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Investment Funds Mutual Funds Equity [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Equity Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
US Treasury and Government [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Exchange Traded Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Corporate Bond Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Foreign Government Debt Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Private Placement [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Taxable Municipal Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Treasury Inflation-Protected Securities [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Yankee Bonds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Commingled funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Fixed Income Funds [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
Real Estate [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
MRO Other investments [Member]
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Foreign Pension Plans, Defined Benefit [Member]
MRO Other investments [Member]
Defined Benefit Plan Disclosure [Line Items]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
Defined Benefit Plan, Fair Value of Plan Assets $ 625,000,000 $ 630,000,000 $ 516,000,000 $ 20,000,000 $ 17,000,000 $ 288,000,000 [1] $ 312,000,000 [1] $ 4,000,000 $ 23,000,000 $ 25,000,000 $ 2,000,000 $ 2,000,000 $ 1,000,000 $ 0 [2] $ 0 [2] $ 0 [3] $ 0 [3] $ 63,000,000 $ 67,000,000 $ 1,000,000 $ 8,000,000 $ 127,000,000 [4] $ 96,000,000 [4] $ 1,000,000 $ 7,000,000 $ 5,000,000 $ 21,000,000 $ 18,000,000 $ 13,000,000 $ 14,000,000 $ 1,000,000 $ 3,000,000 $ 2,000,000 $ 17,000,000 [5] $ 28,000,000 [5] $ 0 [6] $ 0 [6] $ 22,000,000 [7] $ 23,000,000 [7] $ 12,000,000 $ 12,000,000 $ 597,000,000 $ 500,000,000 $ 412,000,000 $ 1,000,000 $ 1,000,000 $ 0 [1] $ 0 [1] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 219,000,000 [2] $ 171,000,000 [2] $ 186,000,000 [3] $ 152,000,000 [3] $ 0 $ 0 $ 0 $ 0 $ 0 [4] $ 0 [4]    $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 [5] $ 0 [5] $ 178,000,000 [6] $ 166,000,000 [6] $ 0 [7] $ 0 [7] $ 13,000,000 $ 10,000,000 $ 0 $ 0 $ 0 $ 378,000,000 $ 405,000,000 $ 19,000,000 $ 16,000,000 $ 288,000,000 [1] $ 312,000,000 [1] $ 4,000,000 $ 0 $ 0 $ 2,000,000 $ 2,000,000 $ 0 $ 0 [2] $ 0 [2] $ 0 [3] $ 0 [3] $ 63,000,000 $ 67,000,000 $ 1,000,000 $ 8,000,000 $ 0 [4] $ 0 [4] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 1,000,000 $ 0 $ 0 $ 0 [5] $ 0 [5] $ 0 [6] $ 0 [6] $ 0 [7] $ 0 [7] $ 0 $ 0 $ 220,000,000 $ 172,000,000 $ 1,000,000 $ 1,000,000 $ 0 [1] $ 0 [1] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 219,000,000 [2] $ 171,000,000 [2] $ 0 [3] $ 0 [3] $ 0 $ 0 $ 0 $ 0 $ 0 [4] $ 0 [4] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 [5] $ 0 [5] $ 0 [6] $ 0 [6] $ 0 [7] $ 0 [7] $ 0 $ 0 $ 190,000,000 $ 165,000,000 $ 1,000,000 $ 1,000,000 $ 0 [1] $ 0 [1] $ 0 $ 0 $ 0 $ 0 $ 0 $ 1,000,000 $ 0 [2] $ 0 [2] $ 0 [3] $ 0 [3] $ 0 $ 0 $ 0 $ 0 $ 127,000,000 [4] $ 96,000,000 [4] $ 1,000,000 $ 7,000,000 $ 5,000,000 $ 21,000,000 $ 18,000,000 $ 13,000,000 $ 14,000,000 $ 0 $ 3,000,000 $ 2,000,000 $ 17,000,000 [5] $ 28,000,000 [5] $ 0 [6] $ 0 [6] $ 0 [7] $ 0 [7] $ 0 $ 0 $ 377,000,000 $ 328,000,000 $ 0 $ 0 $ 0 [1] $ 0 [1] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 [2] $ 0 [2] $ 186,000,000 [3] $ 152,000,000 [3] $ 0 $ 0 $ 0 $ 0 $ 0 [4] $ 0 [4] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 [5] $ 0 [5] $ 178,000,000 [6] $ 166,000,000 [6] $ 0 [7] $ 0 [7] $ 13,000,000 $ 10,000,000                 $ 57,000,000 $ 60,000,000 $ 0 $ 0 $ 0 [1] $ 0 [1] $ 0 $ 23,000,000 $ 25,000,000 $ 0 $ 0 $ 0 $ 0 [2] $ 0 [2] $ 0 [3] $ 0 [3] $ 0 $ 0 $ 0 $ 0 $ 0 [4] $ 0 [4] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 [5] $ 0 [5] $ 0 [6] $ 0 [6] $ 22,000,000 [7] $ 23,000,000 [7] $ 12,000,000 $ 12,000,000 $ 0 $ 0 $ 0 $ 0 $ 0 [1] $ 0 [1] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 [2] $ 0 [2] $ 0 [3] $ 0 [3] $ 0 $ 0 $ 0 $ 0 $ 0 [4] $ 0 [4] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 [5] $ 0 [5] $ 0 [6] $ 0 [6] $ 0 [7] $ 0 [7] $ 0 $ 0
Change in plan assets:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           60,000,000 58,000,000 25,000,000 23,000,000 23,000,000 21,000,000 12,000,000 14,000,000                                                                                                                                                                
Actual return on plan assets:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
Realized                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           7,000,000 2,000,000 6,000,000 2,000,000 1,000,000 0 0 0                                                                                                                                                                
Unrealized                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           0 0 (1,000,000) 1,000,000 1,000,000 1,000,000 0 (2,000,000)                                                                                                                                                                
Purchases                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           7,000,000 7,000,000 6,000,000 4,000,000 1,000,000 3,000,000 0 0                                                                                                                                                                
Sales                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           (17,000,000) (7,000,000) (13,000,000) (5,000,000) (4,000,000) (2,000,000) 0 0                                                                                                                                                                
Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           $ 57,000,000 $ 60,000,000 $ 23,000,000 $ 25,000,000 $ 22,000,000 $ 23,000,000 $ 12,000,000 $ 12,000,000                                                                                                                                                                
Defined Benefit Plan, U.S. and non-U.S. Common Stock in Major Sectors           60.00%               75.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
Defined Benefit Plan, U.S. and non-U.S. Common Stock in Other Sectors, Percentage           40.00%               25.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
Defined Benefit Plan, Investments Held in non-U.S. Common Stock in Major Sectors, Percentage                               80.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
Defined Benefit Plan, Investments Held in non-U.S. Common Stock in Other Sectors, Percentage                               20.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
Defined Benefit Plan, U.S. and non-U.S. Corporate Bonds in Major Sectors, Percentage                                           70.00%                       90.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
Defined Benefit Plan, U.S. and non-U.S. Corporate Bonds in Other Sectors, Percentage                                           30.00%                       10.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
Defined Benefit Plan, U.S. and non-U.S. Investments, Government and Corporate Bonds in Major Sectors, Percentage                                                                       75.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Defined Benefit Plan, U.S. and non-U.S. Investments Held in Other Sectors, Percentage                                                                       25.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Defined Benefit Plan, Investments in Property Type and Location, Percentage                                                                           70.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
[1] Includes approximately 60 percent of investments held in U.S. and non-U.S. common stocks in the banking, pharmaceuticals, oil and gas, insurance, telecommunications, electric, aerospace/defense, retail, transportation, food processing, semiconductors, and chemicals sectors. The remaining 40 percent of common stock is held in various other sectors.
[2] Includes approximately 75 percent of investments held in U.S. and non-U.S. common stocks in the consumer staples, financial services, health care, energy, basic materials, leisure, and industrial goods and services sectors and 25 percent of investments held among various other sectors. The funds' objective is to outperform their respective benchmark indexes, FTSE ALL Share 5% Capped Index and MSCI World Index, as defined by the investment policy.
[3] Includes approximately 80 percent of investments held in non-U.S. publicly traded common stocks (specifically Asia Pacific, except Japan, and the U.K.) in the financial, consumer staples, information technology, materials, energy, industrials, and telecommunication services sectors and the remaining 20 percent of investments held among various other sectors. The funds' objective is to outperform their respective benchmark indexes, MSCI AC Asia Pacific ex Japan Index, FTSE Small Cap Index, and MSCI Emerging Markets Index, as defined by the investment policy.
[4] Includes approximately 70 percent of U.S. and non-U.S. corporate bonds in the banking and finance, utilities, oil and gas, news/media, and health care sectors. The remaining 30 percent of corporate bonds are in various other sectors.
[5] Includes approximately 90 percent of investments held in U.S. and non-U.S. corporate bonds in the consumer discretionary, financial, industrial, telecommunication services, energy, health care, information technology and materials sectors and 10 percent of investments held among various other sectors.
[6] Includes approximately 75 percent of investments held in U.S. and non-U.S. publicly traded investment grade government and corporate bonds which include gilts, treasuries, financial, corporates, and collateralized asset backed securities and 25 percent of investments held among various other sectors. The funds' objective is to outperform their respective benchmark indexes, as defined by the investment policy.
[7] Includes investments diversified by property type and location. The largest property sector holdings, which represent approximately 70 percent of investments held, are office, hotel, residential, and retail with the greatest percentage of investments made in the U.S. and Asia, which includes the emerging markets of China and India.