Securities Available for Sale, Contractual Maturities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	$ 181,943	$ 167,465
Weighted Average Yield Contractual Maturities, Total	4.38%	4.81%
Due in 1 year, Contractual Maturities	1,994	2,469
Percentage of Weighted Average Yield, Due In 1 year	3.11%	4.12%
Due in 1-5 years, Contractual Maturities	29,682	16,165
Percentage of Weighted Average Yield, Due in 1-5 Years	2.27%	3.72%
Due in 5-10 years, Contractual Maturities	16,529	15,477
Percentage of Weighted Average Yield, Due In 5-10 years	3.53%	3.63%
Due in 10 years or More, Contractual Maturities	133,738	133,354
Percentage of Weighted Average Yield, Due After 10 Years	4.97%	5.10%
US Treasury and Government [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	10,523	1,604
Weighted Average Yield Contractual Maturities, Total	1.06%	2.54%
Due in 1 year, Contractual Maturities	8	9
Percentage of Weighted Average Yield, Due In 1 year	5.35%	5.07%
Due in 1-5 years, Contractual Maturities	9,913	641
Percentage of Weighted Average Yield, Due in 1-5 Years	0.89%	1.72%
Due in 5-10 years, Contractual Maturities	511	852
Percentage of Weighted Average Yield, Due In 5-10 years	3.70%	2.94%
Due in 10 years or More, Contractual Maturities	91	102
Percentage of Weighted Average Yield, Due After 10 Years	3.97%	4.15%
US States and Political Subdivisions [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	24,412	18,654
Weighted Average Yield Contractual Maturities, Total	5.35%	5.99%
Due in 1 year, Contractual Maturities	501	322
Percentage of Weighted Average Yield, Due In 1 year	3.49%	3.83%
Due in 1-5 years, Contractual Maturities	5,065	3,210
Percentage of Weighted Average Yield, Due in 1-5 Years	2.88%	3.57%
Due in 5-10 years, Contractual Maturities	2,075	1,884
Percentage of Weighted Average Yield, Due In 5-10 years	5.60%	6.13%
Due in 10 years or More, Contractual Maturities	16,771	13,238
Percentage of Weighted Average Yield, Due After 10 Years	6.12%	6.60%
Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	111,426	115,794
Weighted Average Yield Contractual Maturities, Total	4.94%	5.05%
Due in 1 year, Contractual Maturities	11	5
Percentage of Weighted Average Yield, Due In 1 year	6.58%	6.63%
Due in 1-5 years, Contractual Maturities	481	29
Percentage of Weighted Average Yield, Due in 1-5 Years	2.60%	6.38%
Due in 5-10 years, Contractual Maturities	1,644	976
Percentage of Weighted Average Yield, Due In 5-10 years	3.59%	4.53%
Due in 10 years or More, Contractual Maturities	109,290	114,784
Percentage of Weighted Average Yield, Due After 10 Years	4.97%	5.05%
Federal agencies [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	78,338	82,037
Weighted Average Yield Contractual Maturities, Total	4.86%	5.01%
Due in 1 year, Contractual Maturities	11	5
Percentage of Weighted Average Yield, Due In 1 year	6.58%	6.63%
Due in 1-5 years, Contractual Maturities	480	28
Percentage of Weighted Average Yield, Due in 1-5 Years	2.61%	6.58%
Due in 5-10 years, Contractual Maturities	743	420
Percentage of Weighted Average Yield, Due In 5-10 years	4.66%	5.23%
Due in 10 years or More, Contractual Maturities	77,104	81,584
Percentage of Weighted Average Yield, Due After 10 Years	4.88%	5.00%
Residential [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	18,360	20,203
Weighted Average Yield Contractual Maturities, Total	4.82%	4.98%
Due in 1 year, Contractual Maturities	0	0
Percentage of Weighted Average Yield, Due In 1 year	0.00%	0.00%
Due in 1-5 years, Contractual Maturities	0	0
Percentage of Weighted Average Yield, Due in 1-5 Years	0.00%	0.00%
Due in 5-10 years, Contractual Maturities	707	341
Percentage of Weighted Average Yield, Due In 5-10 years	1.89%	3.20%
Due in 10 years or More, Contractual Maturities	17,653	19,862
Percentage of Weighted Average Yield, Due After 10 Years	4.93%	5.01%
Commercial [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	14,728	13,554
Weighted Average Yield Contractual Maturities, Total	5.48%	5.39%
Due in 1 year, Contractual Maturities	0	0
Percentage of Weighted Average Yield, Due In 1 year	0.00%	0.00%
Due in 1-5 years, Contractual Maturities	1	1
Percentage of Weighted Average Yield, Due in 1-5 Years	1.55%	1.38%
Due in 5-10 years, Contractual Maturities	194	215
Percentage of Weighted Average Yield, Due In 5-10 years	5.69%	5.28%
Due in 10 years or More, Contractual Maturities	14,533	13,338
Percentage of Weighted Average Yield, Due After 10 Years	5.48%	5.39%
Corporate debt securities [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	11,897	10,279
Weighted Average Yield Contractual Maturities, Total	5.39%	5.94%
Due in 1 year, Contractual Maturities	577	545
Percentage of Weighted Average Yield, Due In 1 year	5.51%	7.82%
Due in 1-5 years, Contractual Maturities	5,748	3,853
Percentage of Weighted Average Yield, Due in 1-5 Years	4.54%	6.01%
Due in 5-10 years, Contractual Maturities	4,195	4,817
Percentage of Weighted Average Yield, Due In 5-10 years	6.47%	5.62%
Due in 10 years or More, Contractual Maturities	1,377	1,064
Percentage of Weighted Average Yield, Due After 10 Years	5.59%	6.21%
Collateralized debt obligations [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	7,232	4,778
Weighted Average Yield Contractual Maturities, Total	0.81%	0.80%
Due in 1 year, Contractual Maturities	0	0
Percentage of Weighted Average Yield, Due In 1 year	0.00%	0.00%
Due in 1-5 years, Contractual Maturities	527	545
Percentage of Weighted Average Yield, Due in 1-5 Years	0.87%	0.88%
Due in 5-10 years, Contractual Maturities	4,787	2,581
Percentage of Weighted Average Yield, Due In 5-10 years	0.70%	0.72%
Due in 10 years or More, Contractual Maturities	1,918	1,652
Percentage of Weighted Average Yield, Due After 10 Years	1.06%	0.90%
Other Debt Securities [Member]
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Contractual Maturities,Total	16,453	16,356
Weighted Average Yield Contractual Maturities, Total	2.17%	2.53%
Due in 1 year, Contractual Maturities	897	1,588
Percentage of Weighted Average Yield, Due In 1 year	1.30%	2.89%
Due in 1-5 years, Contractual Maturities	7,948	7,887
Percentage of Weighted Average Yield, Due in 1-5 Years	2.05%	3.00%
Due in 5-10 years, Contractual Maturities	3,317	4,367
Percentage of Weighted Average Yield, Due In 5-10 years	2.54%	2.01%
Due in 10 years or More, Contractual Maturities	$ 4,291	$ 2,514
Percentage of Weighted Average Yield, Due After 10 Years	2.28%	1.72%

This item represents the fair value of debt securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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