Securities - Amortized Costs, Fair Value (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	$ 325,378	$ 359,892
Available-for-sale Securities, Gross Unrealized Gains	7,215	11,503
Available-for-sale Securities, Gross Unrealized Losses	2,616	250
Available-for-sale Securities	329,977	371,145
Held-to-maturity, amortized costs and estimated fair values
Held-to-maturity Securities, Amortized Cost	24,026	7
Held-to-maturity Securities, Gross unrealized gains	22	1
Held-to-maturity Securities, Gross unrealized losses	317	0
Held-to-maturity Securities, Fair Value	23,731	8
Debt securities [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	322,253	357,142
Available-for-sale Securities, Gross Unrealized Gains	7,198	11,482
Available-for-sale Securities, Gross Unrealized Losses	2,616	250
Available-for-sale Securities	326,835	368,374
Mortgage-backed securities [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	153,419	178,997
Available-for-sale Securities, Gross Unrealized Gains	4,322	7,291
Available-for-sale Securities, Gross Unrealized Losses	1,032	58
Available-for-sale Securities	156,709	186,230
U.S. government agencies [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	76,428	93,693
Available-for-sale Securities, Gross Unrealized Gains	2,364	4,708
Available-for-sale Securities, Gross Unrealized Losses	977	13
Available-for-sale Securities	77,815	98,388
Held-to-maturity, amortized costs and estimated fair values
Held-to-maturity Securities, Amortized Cost	23,107
Commercial mortgage [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	15,891	12,268
Available-for-sale Securities, Gross Unrealized Gains	560	948
Available-for-sale Securities, Gross Unrealized Losses	26	13
Available-for-sale Securities	16,425	13,203
U.S. Treasury and government agencies [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	21,310	12,022
Available-for-sale Securities, Gross Unrealized Gains	385	116
Available-for-sale Securities, Gross Unrealized Losses	306	8
Available-for-sale Securities	21,389	12,130
Obligations of U.S. states and municipalities [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	29,741	19,876
Available-for-sale Securities, Gross Unrealized Gains	707	1,845
Available-for-sale Securities, Gross Unrealized Losses	987	10
Available-for-sale Securities	29,461	21,711
Held-to-maturity, amortized costs and estimated fair values
Held-to-maturity Securities, Amortized Cost	920
Certificates of deposit [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	1,041	2,781
Available-for-sale Securities, Gross Unrealized Gains	1	4
Available-for-sale Securities, Gross Unrealized Losses	1	2
Available-for-sale Securities	1,041	2,783
Non-U.S. government debt securities [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	55,507	65,168
Available-for-sale Securities, Gross Unrealized Gains	863	901
Available-for-sale Securities, Gross Unrealized Losses	122	25
Available-for-sale Securities	56,248	66,044
Corporate debt securities [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	21,043	37,999
Available-for-sale Securities, Gross Unrealized Gains	498	694
Available-for-sale Securities, Gross Unrealized Losses	29	84
Available-for-sale Securities	21,512	38,609
Collateralized loan obligations [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	28,130	27,483
Available-for-sale Securities, Gross Unrealized Gains	236	465
Available-for-sale Securities, Gross Unrealized Losses	136	52
Available-for-sale Securities	28,230	27,896
Other debt obligations [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	12,062	12,816
Available-for-sale Securities, Gross Unrealized Gains	186	166
Available-for-sale Securities, Gross Unrealized Losses	3	11
Available-for-sale Securities	12,245	12,971
US government-sponsored and enterprises obligations [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities	67,000	84,000
Equity securities [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	3,125	2,750
Available-for-sale Securities, Gross Unrealized Gains	17	21
Available-for-sale Securities, Gross Unrealized Losses	0	0
Available-for-sale Securities	3,142	2,771
Residential mortgage-backed securities [Member] | Prime and Alt-A [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	2,744	1,853
Available-for-sale Securities, Gross Unrealized Gains	61	83
Available-for-sale Securities, Gross Unrealized Losses	27	3
Available-for-sale Securities	2,778	1,933
Residential mortgage-backed securities [Member] | Subprime [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	908	825
Available-for-sale Securities, Gross Unrealized Gains	23	28
Available-for-sale Securities, Gross Unrealized Losses	1	0
Available-for-sale Securities	930	853
Residential mortgage-backed securities [Member] | Non- U.S. [Member]
Available-for-sale, amortized costs and estimated fair values
Available-for-sale Securities, Amortized Cost	57,448	70,358
Available-for-sale Securities, Gross Unrealized Gains	1,314	1,524
Available-for-sale Securities, Gross Unrealized Losses	1	29
Available-for-sale Securities	$ 58,761	$ 71,853