Employee Benefit Plans, Fair Value of Assets Qualified Plans (Details) (USD $) In Millions, unless otherwise specified																																																																																																																													12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Other US Companies [Member]		Dec. 31, 2012 Other US Companies [Member]		Dec. 31, 2013 Other US Companies [Member] Fair Value, Inputs, Level 1 [Member]		Dec. 31, 2012 Other US Companies [Member] Fair Value, Inputs, Level 1 [Member]		Dec. 31, 2013 Other US Companies [Member] Fair Value, Inputs, Level 2 [Member]		Dec. 31, 2012 Other US Companies [Member] Fair Value, Inputs, Level 2 [Member]		Dec. 31, 2013 Other US Companies [Member] Fair Value, Inputs, Level 3 [Member]		Dec. 31, 2012 Other US Companies [Member] Fair Value, Inputs, Level 3 [Member]		Dec. 31, 2013 International Companies [Member]	Dec. 31, 2012 International Companies [Member]	Dec. 31, 2013 International Companies [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 International Companies [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 International Companies [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 International Companies [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 International Companies [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 International Companies [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Preferred Stock [Member]	Dec. 31, 2012 Preferred Stock [Member]	Dec. 31, 2013 Preferred Stock [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Preferred Stock [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Preferred Stock [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Preferred Stock [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Preferred Stock [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Preferred Stock [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 International Growth [Member]	Dec. 31, 2012 International Growth [Member]	Dec. 31, 2013 International Growth [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 International Growth [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 International Growth [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 International Growth [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 International Growth [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 International Growth [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Index Funds [Member]		Dec. 31, 2012 Index Funds [Member]		Dec. 31, 2013 Index Funds [Member] Fair Value, Inputs, Level 1 [Member]		Dec. 31, 2012 Index Funds [Member] Fair Value, Inputs, Level 1 [Member]		Dec. 31, 2013 Index Funds [Member] Fair Value, Inputs, Level 2 [Member]		Dec. 31, 2012 Index Funds [Member] Fair Value, Inputs, Level 2 [Member]		Dec. 31, 2013 Index Funds [Member] Fair Value, Inputs, Level 3 [Member]		Dec. 31, 2012 Index Funds [Member] Fair Value, Inputs, Level 3 [Member]		Dec. 31, 2013 Corporate Debt Instruments [Member]	Dec. 31, 2012 Corporate Debt Instruments [Member]	Dec. 31, 2013 Corporate Debt Instruments [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Corporate Debt Instruments [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Corporate Debt Instruments [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Corporate Debt Instruments [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Corporate Debt Instruments [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Corporate Debt Instruments [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 US Treasury Securities [Member]	Dec. 31, 2012 US Treasury Securities [Member]	Dec. 31, 2013 US Treasury Securities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 US Treasury Securities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 US Treasury Securities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 US Treasury Securities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 US Treasury Securities [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 US Treasury Securities [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Other Government Securities [Member]	Dec. 31, 2012 Other Government Securities [Member]	Dec. 31, 2013 Other Government Securities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Other Government Securities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Other Government Securities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Other Government Securities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Other Government Securities [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Other Government Securities [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Common Collective Trusts [Member]	Dec. 31, 2012 Common Collective Trusts [Member]	Dec. 31, 2013 Common Collective Trusts [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Common Collective Trusts [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Common Collective Trusts [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Common Collective Trusts [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Common Collective Trusts [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Common Collective Trusts [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Private Fund [Member]	Dec. 31, 2013 Private Fund [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Private Fund [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Private Fund [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Insurance Contracts [Member]	Dec. 31, 2012 Insurance Contracts [Member]	Dec. 31, 2013 Insurance Contracts [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Insurance Contracts [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Insurance Contracts [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Insurance Contracts [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Insurance Contracts [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Insurance Contracts [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Interest and Dividends Receivable [Member]	Dec. 31, 2012 Interest and Dividends Receivable [Member]	Dec. 31, 2013 Interest and Dividends Receivable [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Interest and Dividends Receivable [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Interest and Dividends Receivable [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Interest and Dividends Receivable [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Interest and Dividends Receivable [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Interest and Dividends Receivable [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Cash and Cash Equivalents [Member]	Dec. 31, 2012 Cash and Cash Equivalents [Member]	Dec. 31, 2013 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Equity Securities [Member]	Dec. 31, 2013 Debt Securities [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	$ 1,909	$ 1,729	$ 1,136	$ 1,035	$ 773	$ 694	$ 0	$ 0	$ 529	[1]	$ 441	[1]	$ 529	[1]	$ 441	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 0	[1]	$ 155	$ 135	$ 155	$ 135	$ 0	$ 0	$ 0	$ 0	$ 3	$ 3	$ 3	$ 2	$ 0	$ 1	$ 0	$ 0	$ 131	$ 127	$ 131	$ 127	$ 0	$ 0	$ 0	$ 0	$ 160	[2]	$ 117	[2]	$ 160	[2]	$ 117	[2]	$ 0	[2]	$ 0	[2]	$ 0	[2]	$ 0	[2]	$ 260	$ 290	$ 0	$ 0	$ 260	$ 290	$ 0	$ 0	$ 81	$ 107	$ 81	$ 107	$ 0	$ 0	$ 0	$ 0	$ 79	$ 68	$ 0	$ 3	$ 79	$ 65	$ 0	$ 0	$ 373	$ 294	$ 0	$ 0	$ 373	$ 294	$ 0	$ 0	$ 38	$ 0	$ 38	$ 0	$ 17	$ 17	$ 0	$ 0	$ 17	$ 17	$ 0	$ 0	$ 5	$ 5	$ 5	$ 5	$ 0	$ 0	$ 0	$ 0	$ 78	$ 125	$ 72	$ 98	$ 6	$ 27	$ 0	$ 0
Employee Benefit Plans (Textual)
Defined benefit plan, actual plan asset allocations																																																																																																																													60.00%	40.00%
Percentage of equity securities in target allocations for plan assets																																																																																																																													70.00%	30.00%

[1] Equity securities are held in a wide range of industrial sectors, including consumer goods, information technology, healthcare, industrials, and financial services.

[2] This class includes primarily investments in approximately 60 percent equities and 40 percent bonds.