|
Securities - Gross Unrealized Losses (Details) (USD $)
In Millions, unless otherwise specified
|
Mar. 31, 2013
Securities
|
Dec. 31, 2012
Securities
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
$ 45,276
|
[1] |
$ 26,336
|
[2] |
| Less than Twelve Months, Gross Unrealized Losses |
(436)
|
[1] |
(279)
|
[2] |
| Twelve Months or Longer, Fair Value |
13,311
|
[1] |
16,314
|
[2] |
| Twelve Months or Longer, Gross Unrealized Losses |
(656)
|
[1] |
(381)
|
[2] |
| Total, Fair Value |
58,587
|
[1] |
42,650
|
[2] |
| Total, Gross Unrealized Losses |
(1,092)
|
[1] |
(660)
|
[2] |
| Table Details [Abstract] |
|
|
|
|
| Number of Available for Sale Securities Amortized Cost Exceeds Fair Value |
2,600
|
|
2,600
|
|
| Available for Sale Securities Amortized Cost Exceeding Fair Value |
(1,092)
|
|
(660)
|
|
|
Temporarily Impaired [Member] | US Government Corporations and Agencies Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
459
|
|
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(2)
|
|
|
|
| Twelve Months or Longer, Fair Value |
3,719
|
|
5,608
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(60)
|
|
(84)
|
|
| Total, Fair Value |
4,178
|
|
5,608
|
|
| Total, Gross Unrealized Losses |
(62)
|
|
(84)
|
|
|
Temporarily Impaired [Member] | Debt Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
45,276
|
|
26,322
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(436)
|
|
(278)
|
|
| Twelve Months or Longer, Fair Value |
13,255
|
|
16,240
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(651)
|
|
(377)
|
|
| Total, Fair Value |
58,531
|
|
42,562
|
|
| Total, Gross Unrealized Losses |
(1,087)
|
|
(655)
|
|
|
Temporarily Impaired [Member] | Taxable Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
43,375
|
|
24,713
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(433)
|
|
(269)
|
|
| Twelve Months or Longer, Fair Value |
12,203
|
|
15,168
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(612)
|
|
(339)
|
|
| Total, Fair Value |
55,578
|
|
39,881
|
|
| Total, Gross Unrealized Losses |
(1,045)
|
|
(608)
|
|
|
Temporarily Impaired [Member] | Agency Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
33,667
|
|
15,593
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(278)
|
|
(133)
|
|
| Twelve Months or Longer, Fair Value |
984
|
|
735
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(346)
|
|
(13)
|
|
| Total, Fair Value |
34,651
|
|
16,328
|
|
| Total, Gross Unrealized Losses |
(624)
|
|
(146)
|
|
|
Temporarily Impaired [Member] | Collateralized Mortgage Obligations [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
5,987
|
|
5,135
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(140)
|
|
(121)
|
|
| Twelve Months or Longer, Fair Value |
4,132
|
|
4,994
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(77)
|
|
(97)
|
|
| Total, Fair Value |
10,119
|
|
10,129
|
|
| Total, Gross Unrealized Losses |
(217)
|
|
(218)
|
|
|
Temporarily Impaired [Member] | Residential Mortgage Backed Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
562
|
|
592
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(11)
|
|
(13)
|
|
| Twelve Months or Longer, Fair Value |
1,569
|
|
1,555
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(100)
|
|
(110)
|
|
| Total, Fair Value |
2,131
|
|
2,147
|
|
| Total, Gross Unrealized Losses |
(111)
|
|
(123)
|
|
|
Temporarily Impaired [Member] | Foreign Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
1,864
|
|
1,715
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(1)
|
|
(1)
|
|
| Twelve Months or Longer, Fair Value |
156
|
|
563
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(7)
|
|
(5)
|
|
| Total, Fair Value |
2,020
|
|
2,278
|
|
| Total, Gross Unrealized Losses |
(8)
|
|
(6)
|
|
|
Temporarily Impaired [Member] | Corporate Bond Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
0
|
|
0
|
|
| Less than Twelve Months, Gross Unrealized Losses |
0
|
|
0
|
|
| Twelve Months or Longer, Fair Value |
278
|
|
277
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(11)
|
|
(16)
|
|
| Total, Fair Value |
278
|
|
277
|
|
| Total, Gross Unrealized Losses |
(11)
|
|
(16)
|
|
|
Temporarily Impaired [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
836
|
|
1,678
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(1)
|
|
(1)
|
|
| Twelve Months or Longer, Fair Value |
1,365
|
|
1,436
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(11)
|
|
(14)
|
|
| Total, Fair Value |
2,201
|
|
3,114
|
|
| Total, Gross Unrealized Losses |
(12)
|
|
(15)
|
|
|
Temporarily Impaired [Member] | Tax-exempt securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
1,901
|
|
1,609
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(3)
|
|
(9)
|
|
| Twelve Months or Longer, Fair Value |
1,052
|
|
1,072
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(39)
|
|
(38)
|
|
| Total, Fair Value |
2,953
|
|
2,681
|
|
| Total, Gross Unrealized Losses |
(42)
|
|
(47)
|
|
|
Other Than Temporarily Impaired [Member] | Residential Mortgage Backed Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
0
|
[3] |
14
|
[3] |
| Less than Twelve Months, Gross Unrealized Losses |
0
|
[3] |
(1)
|
[3] |
| Twelve Months or Longer, Fair Value |
56
|
[3] |
74
|
[3] |
| Twelve Months or Longer, Gross Unrealized Losses |
(5)
|
[3] |
(4)
|
[3] |
| Total, Fair Value |
56
|
[3] |
88
|
[3] |
| Total, Gross Unrealized Losses |
$ (5)
|
[3] |
$ (5)
|
[3] |
|
|
|