Guarantees, Pledged Assets and Collateral (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Guarantees [Abstract]
Carrying value	$ 1,111	$ 1,084
Maximum exposure to loss	64,630	69,849
Guarantee Obligations, Noninvestment Grade	28,711	29,885
Pledged Assets and Collateral
Pledged assets without the right to sell or repledge	373,337	406,814
Standby Letters of Credit [Member]
Guarantees [Abstract]
Carrying value	107	142
Maximum exposure to loss	41,817	42,159
Guarantee Obligations, Noninvestment Grade	20,595	19,596
Residual value guarantees [Member]
Guarantees [Abstract]
Carrying value	8	8
Maximum exposure to loss	197	197
Guarantee Obligations, Noninvestment Grade	0	0
Liquidity agreements [Member]
Guarantees [Abstract]
Carrying value	0	0
Maximum exposure to loss	1	49
Guarantee Obligations, Noninvestment Grade	1	1
Securities lending and other indemnifications [Member]
Guarantees [Abstract]
Carrying value	17	45
Maximum exposure to loss	8,378	13,645
Guarantee Obligations, Noninvestment Grade	1,969	3,993
Written put options [Member]
Guarantees [Abstract]
Carrying value	843	747
Maximum exposure to loss	8,066	8,134
Guarantee Obligations, Noninvestment Grade	2,289	2,615
Loans and MHFS sold with recourse [Member]
Guarantees [Abstract]
Carrying value	113	119
Maximum exposure to loss	5,925	5,474
Guarantee Obligations, Noninvestment Grade	3,763	3,564
Contingent consideration [Member]
Guarantees [Abstract]
Carrying value	21	23
Maximum exposure to loss	95	118
Guarantee Obligations, Noninvestment Grade	93	116
Other guarantees [Member]
Guarantees [Abstract]
Carrying value	2	0
Maximum exposure to loss	151	73
Guarantee Obligations, Noninvestment Grade	1	0
Available for sale Securities [Member]
Pledged Assets and Collateral
Pledged assets without the right to sell or repledge	87,926	94,212
Loans and Finance Receivables [Member]
Pledged Assets and Collateral
Pledged assets without the right to sell or repledge	$ 285,411	$ 312,602