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Postretirement Benefit Plans (Accumulated Benefit Obligation) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Pension Benefit Plan [Member]
Principal pension plans
Dec. 31, 2012
Pension Benefit Plan [Member]
Principal pension plans
Dec. 31, 2011
Pension Benefit Plan [Member]
Principal pension plans
Dec. 31, 2013
Pension Benefit Plan [Member]
Other Pension Plan, Defined Benefit [Member]
Dec. 31, 2012
Pension Benefit Plan [Member]
Other Pension Plan, Defined Benefit [Member]
Dec. 31, 2011
Pension Benefit Plan [Member]
Other Pension Plan, Defined Benefit [Member]
Dec. 31, 2013
Pension Benefit Plan [Member]
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Dec. 31, 2012
Pension Benefit Plan [Member]
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Dec. 31, 2013
Pension Benefit Plan [Member]
Other Pension Plans [Member]
Dec. 31, 2012
Pension Benefit Plan [Member]
Other Pension Plans [Member]
Dec. 31, 2013
Pension Benefit Plan [Member]
Funded Plans With Assets Less Than ABO [Member]
Dec. 31, 2012
Pension Benefit Plan [Member]
Funded Plans With Assets Less Than ABO [Member]
Dec. 31, 2013
Pension Benefit Plan [Member]
Unfunded Plans [Member]
Dec. 31, 2012
Pension Benefit Plan [Member]
Unfunded Plans [Member]
Dec. 31, 2013
Retiree Benefit Plan [Member]
Dec. 31, 2013
Retiree Benefit Plan [Member]
Principal Retiree Health and Life Insurance Plans [Member]
Dec. 31, 2012
Retiree Benefit Plan [Member]
Principal Retiree Health and Life Insurance Plans [Member]
Accumulated Benefit Obligation [Abstract]                                  
Accumulated Benefit Obligation $ 50,967 $ 55,664         $ 3,946 $ 4,114 $ 12,629 $ 12,687 $ 60,715 $ 66,069 $ 5,243 $ 5,390   $ 7,626 $ 9,218
Plan Assets With Less Than ABO                                  
Plan assets 48,297 44,738 42,137 11,059 9,702 8,381         57,430 53,276          
Accumulated Benefit Obligation 50,967 55,664         3,946 4,114 12,629 12,687 60,715 66,069 5,243 5,390   7,626 9,218
Projected benefit obligation             5,162 5,494     63,532 69,234 6,512 6,828      
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates                                  
APBO 1% Increase                             788    
APBO 1% Decrease                             671    
Service and interest cost 1% Increase                             63    
Service and interest cost 1% Decrease                             $ 52