Derivative Instruments (Details 2) (Customer-Related Positions [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Derivative Financial Instruments, Assets [Member] | Foreign exchange rate contracts [Member] | Forwards, spots and swaps [Member]
Customer-related derivative positions of the company
Notional Value	$ 9,106	$ 7,772
Fair Value, Assets	420	384
Weighted - Average Remaining Maturity In Years	0.64	0.74
Derivative Financial Instruments, Assets [Member] | Foreign exchange rate contracts [Member] | Purchased Option [Member]
Customer-related derivative positions of the company
Notional Value	105	224
Fair Value, Assets	2	6
Weighted - Average Remaining Maturity In Years	0.47	0.40
Derivative Financial Instruments, Assets [Member] | Foreign exchange rate contracts [Member] | Written Option [Member]
Customer-related derivative positions of the company
Notional Value	0	0
Fair Value, Assets	0	0
Weighted - Average Remaining Maturity In Years	0	0
Derivative Financial Instruments, Assets [Member] | Interest rate contracts [Member] | Receive fixed/pay floating swaps [Member]
Customer-related derivative positions of the company
Notional Value	15,280	15,730
Fair Value, Assets	918	956
Weighted - Average Remaining Maturity In Years	4.74	4.64
Derivative Financial Instruments, Assets [Member] | Interest rate contracts [Member] | Pay fixed/receive floating swaps [Member]
Customer-related derivative positions of the company
Notional Value	750	1,315
Fair Value, Assets	10	24
Weighted - Average Remaining Maturity In Years	6.85	6.12
Derivative Financial Instruments, Assets [Member] | Interest rate contracts [Member] | Purchased Option [Member]
Customer-related derivative positions of the company
Notional Value	2,272	2,024
Fair Value, Assets	11	13
Weighted - Average Remaining Maturity In Years	2.04	1.98
Derivative Financial Instruments, Assets [Member] | Interest rate contracts [Member] | Written Option [Member]
Customer-related derivative positions of the company
Notional Value	312	472
Fair Value, Assets	10	12
Weighted - Average Remaining Maturity In Years	0.32	0.26
Derivative Financial Instruments, Liabilities [Member] | Foreign exchange rate contracts [Member] | Forwards, spots and swaps [Member]
Customer-related derivative positions of the company
Notional Value	9,047	7,694
Fair Value, Liabilities	401	360
Weighted - Average Remaining Maturity In Years	0.64	0.75
Derivative Financial Instruments, Liabilities [Member] | Foreign exchange rate contracts [Member] | Purchased Option [Member]
Customer-related derivative positions of the company
Notional Value	0	0
Fair Value, Liabilities	0	0
Weighted - Average Remaining Maturity In Years	0	0
Derivative Financial Instruments, Liabilities [Member] | Foreign exchange rate contracts [Member] | Written Option [Member]
Customer-related derivative positions of the company
Notional Value	105	224
Fair Value, Liabilities	2	6
Weighted - Average Remaining Maturity In Years	0.47	0.40
Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member] | Receive fixed/pay floating swaps [Member]
Customer-related derivative positions of the company
Notional Value	780	1,294
Fair Value, Liabilities	9	21
Weighted - Average Remaining Maturity In Years	5.38	6.01
Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member] | Pay fixed/receive floating swaps [Member]
Customer-related derivative positions of the company
Notional Value	15,370	15,769
Fair Value, Liabilities	884	922
Weighted - Average Remaining Maturity In Years	4.71	4.68
Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member] | Purchased Option [Member]
Customer-related derivative positions of the company
Notional Value	75	115
Fair Value, Liabilities	10	12
Weighted - Average Remaining Maturity In Years	0.34	0.36
Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member] | Written Option [Member]
Customer-related derivative positions of the company
Notional Value	2,076	1,667
Fair Value, Liabilities	$ 11	$ 13
Weighted - Average Remaining Maturity In Years	2.21	2.35