Fair Value Measurement and Fair Value of Financial Instruments (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Trading Liabilities
Reconciliation of assets measured using significant unobservable inputs
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	$ (136)
Total gains (losses) (realized/unrealized) included in income before taxes	(120)	18
Sales	(16)	(8)
Settlements	8	7
Transfers into Level 3, liability		(153)
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, ending of period	(264)	(136)
Changes in unrealized gains (losses) included in income before taxes for liabilities still held at end of period	(120)	18
Other Liabilities
Reconciliation of assets measured using significant unobservable inputs
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, beginning of period	(95)	(51)
Total gains (losses) (realized/unrealized) included in income before taxes	(4)	(41)
Purchases/additions, liability		(3)
Reconciliation of liability balance at fair value on a recurring basis using significant unobservable inputs, ending of period	(99)	(95)
Changes in unrealized gains (losses) included in income before taxes for liabilities still held at end of period	$ (4)	$ (41)