Securities - Temporarily Impaired and Other-than-temporarily Impaired AFS Debt Securities (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
|
Sep. 30, 2017 |
Sep. 30, 2017 |
Dec. 31, 2016 |
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Credit-related OTTI losses |
$ 0
|
$ 33
|
|
| Other than temporary impairment losses recorded on debt securities |
2
|
14
|
|
| Cumulative credit losses on debt securities held |
284
|
284
|
$ 248
|
| Debt securities |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
124,937
|
124,937
|
181,821
|
| Less than Twelve Months, Gross Unrealized Losses |
(908)
|
(908)
|
(3,072)
|
| Twelve Months or Longer, Fair Value |
41,689
|
41,689
|
8,856
|
| Twelve Months or Longer, Gross Unrealized Losses |
(1,234)
|
(1,234)
|
(228)
|
| Total, Fair Value |
166,626
|
166,626
|
190,677
|
| Total, Gross Unrealized Losses |
(2,142)
|
(2,142)
|
(3,300)
|
| Temporarily impaired AFS debt securities | Debt securities |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
124,910
|
124,910
|
181,727
|
| Less than Twelve Months, Gross Unrealized Losses |
(907)
|
(907)
|
(3,071)
|
| Twelve Months or Longer, Fair Value |
41,659
|
41,659
|
8,455
|
| Twelve Months or Longer, Gross Unrealized Losses |
(1,229)
|
(1,229)
|
(212)
|
| Total, Fair Value |
166,569
|
166,569
|
190,182
|
| Total, Gross Unrealized Losses |
(2,136)
|
(2,136)
|
(3,283)
|
| Temporarily impaired AFS debt securities | Agency |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
96,106
|
96,106
|
135,210
|
| Less than Twelve Months, Gross Unrealized Losses |
(681)
|
(681)
|
(1,846)
|
| Twelve Months or Longer, Fair Value |
17,570
|
17,570
|
3,770
|
| Twelve Months or Longer, Gross Unrealized Losses |
(505)
|
(505)
|
(117)
|
| Total, Fair Value |
113,676
|
113,676
|
138,980
|
| Total, Gross Unrealized Losses |
(1,186)
|
(1,186)
|
(1,963)
|
| Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
2,137
|
2,137
|
3,229
|
| Less than Twelve Months, Gross Unrealized Losses |
(15)
|
(15)
|
(25)
|
| Twelve Months or Longer, Fair Value |
1,051
|
1,051
|
1,028
|
| Twelve Months or Longer, Gross Unrealized Losses |
(30)
|
(30)
|
(26)
|
| Total, Fair Value |
3,188
|
3,188
|
4,257
|
| Total, Gross Unrealized Losses |
(45)
|
(45)
|
(51)
|
| Temporarily impaired AFS debt securities | Commercial |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
5,068
|
5,068
|
9,018
|
| Less than Twelve Months, Gross Unrealized Losses |
(59)
|
(59)
|
(293)
|
| Twelve Months or Longer, Fair Value |
2,819
|
2,819
|
0
|
| Twelve Months or Longer, Gross Unrealized Losses |
(109)
|
(109)
|
0
|
| Total, Fair Value |
7,887
|
7,887
|
9,018
|
| Total, Gross Unrealized Losses |
(168)
|
(168)
|
(293)
|
| Temporarily impaired AFS debt securities | Non-agency residential |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
140
|
140
|
212
|
| Less than Twelve Months, Gross Unrealized Losses |
(7)
|
(7)
|
(1)
|
| Twelve Months or Longer, Fair Value |
118
|
118
|
204
|
| Twelve Months or Longer, Gross Unrealized Losses |
(8)
|
(8)
|
(13)
|
| Total, Fair Value |
258
|
258
|
416
|
| Total, Gross Unrealized Losses |
(15)
|
(15)
|
(14)
|
| Temporarily impaired AFS debt securities | Mortgage-backed securities |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
103,451
|
103,451
|
147,669
|
| Less than Twelve Months, Gross Unrealized Losses |
(762)
|
(762)
|
(2,165)
|
| Twelve Months or Longer, Fair Value |
21,558
|
21,558
|
5,002
|
| Twelve Months or Longer, Gross Unrealized Losses |
(652)
|
(652)
|
(156)
|
| Total, Fair Value |
125,009
|
125,009
|
152,671
|
| Total, Gross Unrealized Losses |
(1,414)
|
(1,414)
|
(2,321)
|
| Temporarily impaired AFS debt securities | U.S. Treasury and agency securities |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
20,685
|
20,685
|
28,462
|
| Less than Twelve Months, Gross Unrealized Losses |
(144)
|
(144)
|
(752)
|
| Twelve Months or Longer, Fair Value |
17,035
|
17,035
|
0
|
| Twelve Months or Longer, Gross Unrealized Losses |
(482)
|
(482)
|
0
|
| Total, Fair Value |
37,720
|
37,720
|
28,462
|
| Total, Gross Unrealized Losses |
(626)
|
(626)
|
(752)
|
| Temporarily impaired AFS debt securities | Non-U.S. securities |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
774
|
774
|
52
|
| Less than Twelve Months, Gross Unrealized Losses |
(1)
|
(1)
|
(1)
|
| Twelve Months or Longer, Fair Value |
0
|
0
|
142
|
| Twelve Months or Longer, Gross Unrealized Losses |
0
|
0
|
(2)
|
| Total, Fair Value |
774
|
774
|
194
|
| Total, Gross Unrealized Losses |
(1)
|
(1)
|
(3)
|
| Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
0
|
0
|
762
|
| Less than Twelve Months, Gross Unrealized Losses |
0
|
0
|
(5)
|
| Twelve Months or Longer, Fair Value |
384
|
384
|
1,438
|
| Twelve Months or Longer, Gross Unrealized Losses |
(3)
|
(3)
|
(18)
|
| Total, Fair Value |
384
|
384
|
2,200
|
| Total, Gross Unrealized Losses |
(3)
|
(3)
|
(23)
|
| Temporarily impaired AFS debt securities | Total taxable securities |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
124,910
|
124,910
|
176,945
|
| Less than Twelve Months, Gross Unrealized Losses |
(907)
|
(907)
|
(2,923)
|
| Twelve Months or Longer, Fair Value |
38,977
|
38,977
|
6,582
|
| Twelve Months or Longer, Gross Unrealized Losses |
(1,137)
|
(1,137)
|
(176)
|
| Total, Fair Value |
163,887
|
163,887
|
183,527
|
| Total, Gross Unrealized Losses |
(2,044)
|
(2,044)
|
(3,099)
|
| Temporarily impaired AFS debt securities | Tax-exempt securities |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
0
|
0
|
4,782
|
| Less than Twelve Months, Gross Unrealized Losses |
0
|
0
|
(148)
|
| Twelve Months or Longer, Fair Value |
2,682
|
2,682
|
1,873
|
| Twelve Months or Longer, Gross Unrealized Losses |
(92)
|
(92)
|
(36)
|
| Total, Fair Value |
2,682
|
2,682
|
6,655
|
| Total, Gross Unrealized Losses |
(92)
|
(92)
|
(184)
|
| Other-than-temporarily impaired AFS debt securities | Non-agency residential |
|
|
|
| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
|
|
|
| Less than Twelve Months, Fair Value |
27
|
27
|
94
|
| Less than Twelve Months, Gross Unrealized Losses |
(1)
|
(1)
|
(1)
|
| Twelve Months or Longer, Fair Value |
30
|
30
|
401
|
| Twelve Months or Longer, Gross Unrealized Losses |
(5)
|
(5)
|
(16)
|
| Total, Fair Value |
57
|
57
|
495
|
| Total, Gross Unrealized Losses |
$ (6)
|
$ (6)
|
$ (17)
|