|
Securities - Gross Unrealized Losses (Details) (USD $)
In Millions, unless otherwise specified
|
Dec. 31, 2012
Securities
|
Dec. 31, 2011
Securities
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
$ 26,336
|
[1] |
$ 25,233
|
[1] |
| Less than Twelve Months, Gross Unrealized Losses |
(279)
|
[1] |
344
|
[1] |
| Twelve Months or Longer, Fair Value |
16,314
|
[1] |
48,555
|
[1] |
| Twelve Months or Longer, Gross Unrealized Losses |
(381)
|
[1] |
1,346
|
[1] |
| Total, Fair Value |
42,650
|
[1] |
73,788
|
[1] |
| Total, Gross Unrealized Losses |
(660)
|
[1] |
1,690
|
[1] |
| Table Details [Abstract] |
|
|
|
|
| Number of Available for Sale Securities Amortized Cost Exceeds Fair Value |
2,600
|
|
3,800
|
|
| Available for Sale Securities Amortized Cost Exceeding Fair Value |
660
|
|
1,690
|
|
|
Temporarily Impaired [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
|
|
25,075
|
|
| Less than Twelve Months, Gross Unrealized Losses |
|
|
(316)
|
|
| Twelve Months or Longer, Fair Value |
|
|
48,066
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
|
|
(1,301)
|
|
| Total, Fair Value |
|
|
73,141
|
|
| Total, Gross Unrealized Losses |
|
|
(1,617)
|
|
|
Temporarily Impaired [Member] | United States Treasury And Agency 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 |
5,608
|
|
38,269
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(84)
|
|
(811)
|
|
| Total, Fair Value |
5,608
|
|
38,269
|
|
| Total, Gross Unrealized Losses |
(84)
|
|
(811)
|
|
|
Temporarily Impaired [Member] | Debt Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
26,322
|
|
25,044
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(278)
|
|
(315)
|
|
| Twelve Months or Longer, Fair Value |
16,240
|
|
48,060
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(377)
|
|
(1,295)
|
|
| Total, Fair Value |
42,562
|
|
73,104
|
|
| Total, Gross Unrealized Losses |
(655)
|
|
(1,610)
|
|
|
Temporarily Impaired [Member] | Agency Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
15,593
|
|
4,679
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(133)
|
|
(13)
|
|
| Twelve Months or Longer, Fair Value |
735
|
|
474
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(13)
|
|
(8)
|
|
| Total, Fair Value |
16,328
|
|
5,153
|
|
| Total, Gross Unrealized Losses |
(146)
|
|
(21)
|
|
|
Temporarily Impaired [Member] | Collateralized Mortgage Obligations [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
5,135
|
|
11,448
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(121)
|
|
(134)
|
|
| Twelve Months or Longer, Fair Value |
4,994
|
|
976
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(97)
|
|
(33)
|
|
| Total, Fair Value |
10,129
|
|
12,424
|
|
| Total, Gross Unrealized Losses |
(218)
|
|
(167)
|
|
|
Temporarily Impaired [Member] | Residential Mortgage Backed Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
592
|
|
2,112
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(13)
|
|
(59)
|
|
| Twelve Months or Longer, Fair Value |
1,555
|
|
3,950
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(110)
|
|
(350)
|
|
| Total, Fair Value |
2,147
|
|
6,062
|
|
| Total, Gross Unrealized Losses |
(123)
|
|
(409)
|
|
|
Temporarily Impaired [Member] | Commercial Mortgage Backed Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
|
|
55
|
|
| Less than Twelve Months, Gross Unrealized Losses |
|
|
(1)
|
|
| Twelve Months or Longer, Fair Value |
|
|
0
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
|
|
0
|
|
| Total, Fair Value |
|
|
55
|
|
| Total, Gross Unrealized Losses |
|
|
(1)
|
|
|
Temporarily Impaired [Member] | Foreign Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
1,715
|
|
1,008
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(1)
|
|
(13)
|
|
| Twelve Months or Longer, Fair Value |
563
|
|
165
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(5)
|
|
(1)
|
|
| Total, Fair Value |
2,278
|
|
1,173
|
|
| Total, Gross Unrealized Losses |
(6)
|
|
(14)
|
|
|
Temporarily Impaired [Member] | Corporate Bond Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
0
|
|
415
|
|
| Less than Twelve Months, Gross Unrealized Losses |
0
|
|
(29)
|
|
| Twelve Months or Longer, Fair Value |
277
|
|
111
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(16)
|
|
(8)
|
|
| Total, Fair Value |
277
|
|
526
|
|
| Total, Gross Unrealized Losses |
(16)
|
|
(37)
|
|
|
Temporarily Impaired [Member] | Other Debt Obligations [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
1,678
|
|
4,210
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(1)
|
|
(41)
|
|
| Twelve Months or Longer, Fair Value |
1,436
|
|
1,361
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(14)
|
|
(19)
|
|
| Total, Fair Value |
3,114
|
|
5,571
|
|
| Total, Gross Unrealized Losses |
(15)
|
|
(60)
|
|
|
Temporarily Impaired [Member] | Taxable Securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
24,713
|
|
23,927
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(269)
|
|
(290)
|
|
| Twelve Months or Longer, Fair Value |
15,168
|
|
45,306
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(339)
|
|
(1,230)
|
|
| Total, Fair Value |
39,881
|
|
69,233
|
|
| Total, Gross Unrealized Losses |
(608)
|
|
(1,520)
|
|
|
Temporarily Impaired [Member] | Tax-exempt securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
1,609
|
|
1,117
|
|
| Less than Twelve Months, Gross Unrealized Losses |
(9)
|
|
(25)
|
|
| Twelve Months or Longer, Fair Value |
1,072
|
|
2,754
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
(38)
|
|
(65)
|
|
| Total, Fair Value |
2,681
|
|
3,871
|
|
| Total, Gross Unrealized Losses |
(47)
|
|
(90)
|
|
|
Temporarily Impaired [Member] | Equity Securities
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
|
|
31
|
|
| Less than Twelve Months, Gross Unrealized Losses |
|
|
(1)
|
|
| Twelve Months or Longer, Fair Value |
|
|
6
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
|
|
(6)
|
|
| Total, Fair Value |
|
|
37
|
|
| Total, Gross Unrealized Losses |
|
|
(7)
|
|
|
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 |
14
|
[2] |
|
|
| Less than Twelve Months, Gross Unrealized Losses |
1
|
[2] |
|
|
| Twelve Months or Longer, Fair Value |
74
|
[2] |
|
|
| Twelve Months or Longer, Gross Unrealized Losses |
4
|
[2] |
|
|
| Total, Fair Value |
88
|
[2] |
|
|
| Total, Gross Unrealized Losses |
5
|
[2] |
|
|
|
Other Than Temporarily Impaired [Member] | Tax-exempt securities [Member]
|
|
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
|
| Less than Twelve Months, Fair Value |
|
|
158
|
[2] |
| Less than Twelve Months, Gross Unrealized Losses |
|
|
28
|
[2] |
| Twelve Months or Longer, Fair Value |
|
|
489
|
[2] |
| Twelve Months or Longer, Gross Unrealized Losses |
|
|
45
|
[2] |
| Total, Fair Value |
|
|
647
|
[2] |
| Total, Gross Unrealized Losses |
|
|
$ 73
|
[2] |
|
|
|