Investment Securities (Contractual Maturity of Debt Securities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Total	$ 49,632	$ 58,171
Available-for-sale Securities, Fair value	49,715	57,310
Weighted-average yield, GAAP basis, available for sale securities	3.58%
Total	12,390	6,952
Held-to-maturity Securities, Fair Value	12,724	7,177
Weighted-average yield, GAAP basis, held to maturity securities	4.08%
US Treasury and Government Agencies Securities [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
After 1 year through 5 years	2,054
After 5 years through 10 years	910
After 10 years	433
After 10 years	219
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
After 1 year through 5 years	6
After 5 years through 10 years	947
After 10 years	26,010
After 10 years	4,588
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
After 5 years through 10 years	28
After 10 years	6,921
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
After 1 year through 5 years	764
After 5 years through 10 years	192
After 1 year through 5 years	16
After 5 years through 10 years	1,269
After 10 years	5
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
1 year or less	28
After 1 year through 5 years	185
After 5 years through 10 years	49
After 10 years	2,384
1 year or less	129
After 1 year through 5 years	39
After 5 years through 10 years	58
After 10 years	3,544
State and Municipal [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
1 year or less	20
After 1 year through 5 years	72
After 5 years through 10 years	278
After 10 years	1,344
After 1 year through 5 years	54
After 5 years through 10 years	71
After 10 years	545
Other Debt Securities [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
1 year or less	134
After 1 year through 5 years	1,507
After 5 years through 10 years	606
After 10 years	494
After 1 year through 5 years	1
After 5 years through 10 years	363
Asset backed [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
1 year or less	68
After 1 year through 5 years	887
After 5 years through 10 years	451
After 10 years	2,508
1 year or less	8
After 1 year through 5 years	1,011
After 5 years through 10 years	105
After 10 years	365
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
1 year or less	250
After 1 year through 5 years	5,475
After 5 years through 10 years	3,461
After 10 years	40,094
Total	49,280
Available-for-sale Securities, Fair value	49,363
1 year or less	137
After 1 year through 5 years	1,121
After 5 years through 10 years	1,866
After 10 years	9,266
Debt Securities [Member] \| One Year or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value	252
Held-to-maturity Securities, Fair Value	137
Debt Securities [Member] \| After One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value	5,634
Held-to-maturity Securities, Fair Value	1,142
Debt Securities [Member] \| After Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value	3,683
Held-to-maturity Securities, Fair Value	1,923
Debt Securities [Member] \| After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair value	39,794
Held-to-maturity Securities, Fair Value	9,522
US Treasury and Government Agencies Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	3,397
Total	219
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	26,963
Total	4,588
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	6,949
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	956
Total	1,290
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	2,646
Total	3,770
Asset backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	3,914
Total	1,489
State and Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	1,714
Total	670
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	2,741
Total	$ 364
One Year or Less [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.99%
Weighted-average yield, GAAP basis, held to maturity securities	5.25%
After One Year Through Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	2.77%
Weighted-average yield, GAAP basis, held to maturity securities	2.05%
After Five Years Through Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.48%
Weighted-average yield, GAAP basis, held to maturity securities	3.35%
After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average yield, GAAP basis, available for sale securities	3.71%
Weighted-average yield, GAAP basis, held to maturity securities	4.45%

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