|
Securities Available for Sale, Contractual Maturities (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
12 Months Ended |
|
Mar. 31, 2012
|
Dec. 31, 2011
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
$ 227,113 |
$ 219,196 |
| Weighted Average Yield Contractual Maturities, Total |
4.07% |
4.12% |
| Due in 1 year, Contractual Maturities |
2,285 |
1,899 |
| Percentage of Weighted Average Yield, Due In 1 year |
3.41% |
3.85% |
| Due in 1-5 years, Contractual Maturities |
40,950 |
43,305 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
2.24% |
2.36% |
| Due in 5-10 years, Contractual Maturities |
21,877 |
19,665 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
3.32% |
3.31% |
| Due in 10 years or More, Contractual Maturities |
162,001 |
154,327 |
| Percentage of Weighted Average Yield, Due After 10 Years |
4.64% |
4.72% |
|
US Treasury and Government [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
4,678 |
6,968 |
| Weighted Average Yield Contractual Maturities, Total |
0.97% |
0.91% |
| Due in 1 year, Contractual Maturities |
57 |
57 |
| Percentage of Weighted Average Yield, Due In 1 year |
0.50% |
0.48% |
| Due in 1-5 years, Contractual Maturities |
4,170 |
6,659 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
0.81% |
0.84% |
| Due in 5-10 years, Contractual Maturities |
416 |
194 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
2.41% |
2.73% |
| Due in 10 years or More, Contractual Maturities |
35 |
58 |
| Percentage of Weighted Average Yield, Due After 10 Years |
3.96% |
3.81% |
|
US States and Political Subdivisions [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
34,237 |
32,593 |
| Weighted Average Yield Contractual Maturities, Total |
4.85% |
4.94% |
| Due in 1 year, Contractual Maturities |
1,040 |
520 |
| Percentage of Weighted Average Yield, Due In 1 year |
3.57% |
3.02% |
| Due in 1-5 years, Contractual Maturities |
11,500 |
11,679 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
2.29% |
2.90% |
| Due in 5-10 years, Contractual Maturities |
3,036 |
2,692 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
5.39% |
5.31% |
| Due in 10 years or More, Contractual Maturities |
18,661 |
17,702 |
| Percentage of Weighted Average Yield, Due After 10 Years |
6.41% |
6.28% |
|
Mortgage Backed Securities [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
139,151 |
132,740 |
| Weighted Average Yield Contractual Maturities, Total |
4.44% |
4.55% |
| Due in 1 year, Contractual Maturities |
1 |
1 |
| Percentage of Weighted Average Yield, Due In 1 year |
6.19% |
6.47% |
| Due in 1-5 years, Contractual Maturities |
281 |
442 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
4.39% |
4.02% |
| Due in 5-10 years, Contractual Maturities |
2,071 |
2,126 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
2.82% |
2.72% |
| Due in 10 years or More, Contractual Maturities |
136,798 |
130,171 |
| Percentage of Weighted Average Yield, Due After 10 Years |
4.46% |
4.58% |
|
Federal agencies [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
102,665 |
96,754 |
| Weighted Average Yield Contractual Maturities, Total |
4.26% |
4.39% |
| Due in 1 year, Contractual Maturities |
1 |
1 |
| Percentage of Weighted Average Yield, Due In 1 year |
6.19% |
6.47% |
| Due in 1-5 years, Contractual Maturities |
265 |
442 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
4.33% |
4.02% |
| Due in 5-10 years, Contractual Maturities |
1,294 |
1,399 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
3.09% |
3.07% |
| Due in 10 years or More, Contractual Maturities |
101,105 |
94,912 |
| Percentage of Weighted Average Yield, Due After 10 Years |
4.27% |
4.42% |
|
Residential [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
17,829 |
17,836 |
| Weighted Average Yield Contractual Maturities, Total |
4.45% |
4.51% |
| 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 |
661 |
640 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
2.20% |
1.88% |
| Due in 10 years or More, Contractual Maturities |
17,168 |
17,196 |
| Percentage of Weighted Average Yield, Due After 10 Years |
4.54% |
4.61% |
|
Commercial [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
18,657 |
18,150 |
| Weighted Average Yield Contractual Maturities, Total |
5.40% |
5.40% |
| 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 |
16 |
0 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
5.46% |
0.00% |
| Due in 5-10 years, Contractual Maturities |
116 |
87 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
3.44% |
3.33% |
| Due in 10 years or More, Contractual Maturities |
18,525 |
18,063 |
| Percentage of Weighted Average Yield, Due After 10 Years |
5.41% |
5.41% |
|
Corporate debt securities [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
20,173 |
18,404 |
| Weighted Average Yield Contractual Maturities, Total |
4.50% |
4.64% |
| Due in 1 year, Contractual Maturities |
737 |
815 |
| Percentage of Weighted Average Yield, Due In 1 year |
5.26% |
5.57% |
| Due in 1-5 years, Contractual Maturities |
12,219 |
11,022 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
3.29% |
3.40% |
| Due in 5-10 years, Contractual Maturities |
5,275 |
4,691 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
6.54% |
6.67% |
| Due in 10 years or More, Contractual Maturities |
1,942 |
1,876 |
| Percentage of Weighted Average Yield, Due After 10 Years |
6.29% |
6.38% |
|
Collateralized debt obligations [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
9,163 |
8,599 |
| Weighted Average Yield Contractual Maturities, Total |
1.09% |
1.10% |
| 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 |
570 |
540 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
1.17% |
1.61% |
| Due in 5-10 years, Contractual Maturities |
7,299 |
6,813 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
1.00% |
1.00% |
| Due in 10 years or More, Contractual Maturities |
1,294 |
1,246 |
| Percentage of Weighted Average Yield, Due After 10 Years |
1.55% |
1.42% |
|
Other Debt Securities [Member]
|
|
|
| Available-for-sale Securities, Debt Maturities, Fair Value [Abstract] |
|
|
| Contractual Maturities,Total |
19,711 |
19,892 |
| Weighted Average Yield Contractual Maturities, Total |
1.76% |
1.89% |
| Due in 1 year, Contractual Maturities |
450 |
506 |
| Percentage of Weighted Average Yield, Due In 1 year |
0.38% |
2.29% |
| Due in 1-5 years, Contractual Maturities |
12,210 |
12,963 |
| Percentage of Weighted Average Yield, Due in 1-5 Years |
1.64% |
1.75% |
| Due in 5-10 years, Contractual Maturities |
3,780 |
3,149 |
| Percentage of Weighted Average Yield, Due In 5-10 years |
2.02% |
2.04% |
| Due in 10 years or More, Contractual Maturities |
$ 3,271 |
$ 3,274 |
| Percentage of Weighted Average Yield, Due After 10 Years |
2.09% |
2.29% |