Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) - Parenthetical (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Tax on unrealized gains and losses of derivatives	$ 67	$ 65	$ 29
Tax expense (benefit)	76	10	23
Write down on debt securities, tax	0	0	0
Tax on unrealized holding gains	0	16	33
Tax on reclassification adjustment for gains realized in net income	(62)	(9)	(20)
Impaired debt securities, tax	0	0	0
Loss on debt securities, tax	0	1	(1)
Tax on reclassification adjustment for gains on net income	(1)	0	4
Tax on unfunded pension and postretirement liability	7	(9)	(7)
Tax on reclassification adjustment	1	1	1
Tax on transaction gains (losses)	(1)	1	(1)
Tax on translation gain and loss	$ (9)	$ 0	$ 0