Fair Value (Schedule Of Fair Value Measurements Using Significant Unobservable Inputs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Assets Carried At Fair Value [Member]	Mar. 31, 2011 Assets Carried At Fair Value [Member]	Mar. 31, 2012 Accrued Expenses And Other Liabilities [Member]	Dec. 31, 2011 Accrued Expenses And Other Liabilities [Member]	Mar. 31, 2012 Liabilities Carried At Fair Value [Member]	Mar. 31, 2011 Liabilities Carried At Fair Value [Member]	Mar. 31, 2012 Interest-Rate Contracts [Member]	Mar. 31, 2011 Interest-Rate Contracts [Member]	Mar. 31, 2012 Interest-Rate Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Mar. 31, 2012 Other [Member] Accrued Expenses And Other Liabilities [Member]	Mar. 31, 2011 Other [Member] Accrued Expenses And Other Liabilities [Member]	Mar. 31, 2012 Mortgage-Backed Securities [Member]	Mar. 31, 2011 Mortgage-Backed Securities [Member]	Mar. 31, 2012 Student Loans [Member]	Mar. 31, 2011 Student Loans [Member]	Mar. 31, 2012 Credit Cards [Member]	Mar. 31, 2011 Credit Cards [Member]	Mar. 31, 2012 Other Asset-Backed Securities [Member]	Mar. 31, 2011 Other Asset-Backed Securities [Member]	Mar. 31, 2012 Asset-Backed Securities [Member]	Mar. 31, 2011 Asset-Backed Securities [Member]	Mar. 31, 2012 State And Political Subdivisions [Member]	Mar. 31, 2011 State And Political Subdivisions [Member]	Mar. 31, 2012 Collateralized Mortgage Obligations [Member]	Mar. 31, 2011 Collateralized Mortgage Obligations [Member]	Mar. 31, 2012 Other U.S. Debt Securities [Member]	Mar. 31, 2011 Other U.S. Debt Securities [Member]	Mar. 31, 2012 Investment Securities Available For Sale [Member]	Mar. 31, 2011 Investment Securities Available For Sale [Member]	Mar. 31, 2012 Foreign Exchange Contracts [Member]	Mar. 31, 2011 Foreign Exchange Contracts [Member]	Mar. 31, 2012 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Mar. 31, 2011 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Mar. 31, 2012 Derivative Instruments [Member]	Mar. 31, 2011 Derivative Instruments [Member]	Mar. 31, 2012 Derivative Instruments [Member] Accrued Expenses And Other Liabilities [Member]	Mar. 31, 2011 Derivative Instruments [Member] Accrued Expenses And Other Liabilities [Member]	Mar. 31, 2012 Non-U.S. Debt Securities [Member]	Mar. 31, 2011 Non-U.S. Debt Securities [Member]	Mar. 31, 2012 Non-U.S. Debt Securities [Member] Other [Member]	Mar. 31, 2011 Non-U.S. Debt Securities [Member] Other [Member]	Mar. 31, 2012 Non-U.S. Debt Securities [Member] Mortgage-Backed Securities [Member]	Mar. 31, 2011 Non-U.S. Debt Securities [Member] Mortgage-Backed Securities [Member]	Mar. 31, 2012 Non-U.S. Debt Securities [Member] Asset-Backed Securities [Member]	Mar. 31, 2011 Non-U.S. Debt Securities [Member] Asset-Backed Securities [Member]	Mar. 31, 2011 Non-U.S. Debt Securities [Member] Government Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, beginning balance, Assets			$ 8,691	$ 5,761					$ 10	$ 0				$ 1,189	$ 673	$ 860	$ 1,234	$ 91	$ 43	$ 2,798	$ 2,000	$ 3,749	$ 3,277	$ 50	$ 50	$ 227	$ 359	$ 2	$ 3	$ 8,513	$ 5,507	$ 168	$ 254			$ 178	$ 254			$ 3,296	$ 1,145	$ 71	$ 8	$ 1,457	$ 396	$ 1,768	$ 740	$ 1
Fair Value, beginning balance, Liabilities							201	269			11	9	9																					161	260			181	269
Transfers into Level 3, Assets			21	1						0								21				21								21			1			0	1			0		0		0		0
Transfers into Level 3, Liabilities							0	1					0																						1				1
Transfers out of Level 3, Assets			(3,030)	(826)					0	0				(251)	(403)	(341)	(33)	0	0	0	0	(341)	(33)	0	0	(132)	(132)	0	0	(3,030)	(826)	0	0			0	0			(2,306)	(258)	(65)	0	(1,157)	(198)	(1,084)	(60)	0
Transfers out of Level 3, Liabilities								0
Recorded in Revenue, Assets			71	57					(10)	0						1	2	1	1	10	8	12	11	0	0	134	133	0	0	146	144	(65)	(87)			(75)	(87)			0	0	0	0	0	0	0	0	0
Recorded in Revenue, Liabilities							(84)	(78)			(9)	0	0																					(75)	(78)			(84)	(78)
Recorded in Other Comprehensive Income, Assets			15	56					0	0					1	(2)	1	0	(1)	16	45	14	45	1	1	0	(2)	0	0	15	56	0	0			0	0			0	11	0	(1)	1	0	(1)	11	1
Recorded in Other Comprehensive Income, Liabilities							0	0
Purchases, Assets			1,471	2,175					0	8					636		121	67	31	355	275	422	427	0	0	106	23	0	0	1,361	2,050	110	117			110	125			833	964	308	0	159	473	366	491	0
Purchases, Liabilities							0	0
Issuances, Assets			0	0
Issuances, Liabilities							111	0			0	0																						111				111
Sales, Assets			(72)	0					1									(61)		(12)		(73)		0		0		0		(73)		0				1				0		0		0		0
Sales, Liabilities								117																											117				117
Settlements, Assets			(347)	(365)					(1)	0				(26)	(9)	(7)	(17)	0	1	(77)	(80)	(84)	(96)	(1)	0	(142)	(153)	(2)	0	(260)	(307)	(86)	(58)			(87)	(58)			(5)	(49)	0	(1)	9	11	(14)	(57)	(2)
Settlements, Liabilities							(73)	(68)			(2)	0																						(71)	(68)			(73)	(68)
Fair Value, ending balance, Assets			6,820	6,859					0	8				912	898	511	1,308	119	75	3,090	2,248	3,720	3,631	50	51	193	228	0	3	6,693	6,624	127	227			127	235			1,818	1,813	314	6	469	682	1,035	1,125	0
Fair Value, ending balance, Liabilities							155	241			0	9	9																					126	232			135	241
Change in Unrealized Gains (Losses) Related to Financial Instruments	(461)	605	(47)	(46)	0		(51)	(47)	0	0	0																					(47)	(46)	(51)	(47)	(47)	(46)	(51)	(47)
Other Liabilities					$ 20	$ 20