|
Securities - Amortized Cost, Gains and Losses, and Fair Value (Details) (USD $)
In Millions, unless otherwise specified
|
3 Months Ended |
|
|
|
Mar. 31, 2014
|
Mar. 31, 2013
|
Dec. 31, 2013
|
Dec. 31, 2012
|
| Other Debt Securities, Carried at Fair Value: |
|
|
|
|
|
|
| Amortized Cost |
$ 36,453
|
|
|
$ 34,145
|
|
|
| Gross Unrealized Gains |
82
|
|
|
34
|
|
|
| Gross Unrealized Losses |
(940)
|
|
|
(1,335)
|
|
|
| Other Debt Securities Carried at Fair Value |
35,595
|
|
|
32,844
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Amortized Cost |
289,615
|
|
|
275,290
|
|
|
| Gross Unrealized Gains |
1,602
|
|
|
1,391
|
|
|
| Gross Unrealized Losses |
(5,641)
|
|
|
(7,886)
|
|
|
| Debt Securities Carried at Fair Value |
285,576
|
|
|
268,795
|
|
|
| Held-to-maturity Securities: |
|
|
|
|
|
|
| Amortized Cost |
55,120
|
[1] |
|
55,150
|
|
|
| Gross Unrealized Gains |
50
|
|
|
20
|
|
|
| Gross Unrealized Losses |
(2,064)
|
|
|
(2,740)
|
|
|
| Held-to-maturity, at cost, fair value |
53,106
|
[1] |
|
52,430
|
|
|
| Debt securities: |
|
|
|
|
|
|
| Amortized Cost |
344,735
|
|
|
330,440
|
|
|
| Gross Unrealized Gains |
1,652
|
|
|
1,411
|
|
|
| Gross Unrealized Losses |
(7,705)
|
|
|
(10,626)
|
|
|
| Debt Securities, Fair Value |
338,682
|
|
|
321,225
|
|
|
| In Text Details [Abstract] |
|
|
|
|
|
|
| Accumulated other comprehensive income (loss) |
(7,037)
|
|
(3,488)
|
(8,457)
|
|
(2,797)
|
| Related Income Tax Benefit |
(1,200)
|
|
|
|
|
|
| Nonperforming Debt Securities |
100
|
|
|
103
|
|
|
| Unrealized Mark-to-Market Net Losses in other income (loss) |
444
|
|
(159)
|
|
|
|
| Realized Gains (Losses) on Other Debt Securities |
(17)
|
|
2
|
|
|
|
|
US Government Corporations and Agencies Securities [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
29,580
|
|
|
8,910
|
|
|
| Gross Unrealized Gains |
108
|
|
|
106
|
|
|
| Gross Unrealized Losses |
(121)
|
|
|
(62)
|
|
|
| Debt securities carried at fair value |
29,567
|
|
|
8,954
|
|
|
| Other Debt Securities, Carried at Fair Value: |
|
|
|
|
|
|
| Other Debt Securities Carried at Fair Value |
4,182
|
|
|
4,062
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
33,749
|
|
|
|
|
|
|
Agency MBS [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
169,216
|
|
|
170,112
|
|
|
| Gross Unrealized Gains |
830
|
|
|
777
|
|
|
| Gross Unrealized Losses |
(4,299)
|
|
|
(5,954)
|
|
|
| Debt securities carried at fair value |
165,747
|
|
|
164,935
|
|
|
| Other Debt Securities, Carried at Fair Value: |
|
|
|
|
|
|
| Other Debt Securities Carried at Fair Value |
16,290
|
|
|
16,500
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
182,037
|
|
|
|
|
|
|
Collateralized Mortgage Obligations [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
18,464
|
|
|
22,731
|
|
|
| Gross Unrealized Gains |
217
|
|
|
76
|
|
|
| Gross Unrealized Losses |
(109)
|
|
|
(315)
|
|
|
| Debt securities carried at fair value |
18,572
|
|
|
22,492
|
|
|
| Other Debt Securities, Carried at Fair Value: |
|
|
|
|
|
|
| Other Debt Securities Carried at Fair Value |
123
|
|
|
218
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
18,695
|
|
|
|
|
|
|
Residential Mortgage Backed Securities [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
5,111
|
[2] |
|
6,124
|
[2] |
|
| Gross Unrealized Gains |
244
|
[2] |
|
238
|
[2] |
|
| Gross Unrealized Losses |
(97)
|
[2] |
|
(123)
|
[2] |
|
| Debt securities carried at fair value |
5,258
|
[2] |
|
6,239
|
[2] |
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
5,258
|
|
|
|
|
|
|
Residential Mortgage Backed Securities [Member] | Prime Loan [Member]
|
|
|
|
|
|
|
| Table Details [Abstract] |
|
|
|
|
|
|
| Available-for-sale Securities, Debt Maturities, Percent Held by Rating |
88.00%
|
|
|
89.00%
|
|
|
|
Residential Mortgage Backed Securities [Member] | Alt-A Loan [Member]
|
|
|
|
|
|
|
| Table Details [Abstract] |
|
|
|
|
|
|
| Available-for-sale Securities, Debt Maturities, Percent Held by Rating |
7.00%
|
|
|
7.00%
|
|
|
|
Residential Mortgage Backed Securities [Member] | Subprime Loan [Member]
|
|
|
|
|
|
|
| Table Details [Abstract] |
|
|
|
|
|
|
| Available-for-sale Securities, Debt Maturities, Percent Held by Rating |
5.00%
|
|
|
4.00%
|
|
|
|
Commercial Mortgage Backed Securities [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
1,713
|
|
|
2,429
|
|
|
| Gross Unrealized Gains |
26
|
|
|
63
|
|
|
| Gross Unrealized Losses |
(5)
|
|
|
(12)
|
|
|
| Debt securities carried at fair value |
1,734
|
|
|
2,480
|
|
|
| Other Debt Securities, Carried at Fair Value: |
|
|
|
|
|
|
| Other Debt Securities Carried at Fair Value |
770
|
|
|
749
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
2,504
|
|
|
|
|
|
|
Foreign Securities [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
7,109
|
|
|
7,207
|
|
|
| Gross Unrealized Gains |
31
|
|
|
37
|
|
|
| Gross Unrealized Losses |
(18)
|
|
|
(24)
|
|
|
| Debt securities carried at fair value |
7,122
|
|
|
7,220
|
|
|
| Other Debt Securities, Carried at Fair Value: |
|
|
|
|
|
|
| Other Debt Securities Carried at Fair Value |
14,230
|
[3] |
|
11,315
|
[3] |
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
21,352
|
|
|
|
|
|
|
Corporate Bond Securities [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
831
|
|
|
860
|
|
|
| Gross Unrealized Gains |
18
|
|
|
20
|
|
|
| Gross Unrealized Losses |
(4)
|
|
|
(7)
|
|
|
| Debt securities carried at fair value |
845
|
|
|
873
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
845
|
|
|
|
|
|
|
Other Debt Obligations [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
14,695
|
|
|
16,805
|
|
|
| Gross Unrealized Gains |
42
|
|
|
30
|
|
|
| Gross Unrealized Losses |
(15)
|
|
|
(5)
|
|
|
| Debt securities carried at fair value |
14,722
|
|
|
16,830
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
14,722
|
|
|
|
|
|
|
Taxable Securities [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
246,719
|
|
|
235,178
|
|
|
| Gross Unrealized Gains |
1,516
|
|
|
1,347
|
|
|
| Gross Unrealized Losses |
(4,668)
|
|
|
(6,502)
|
|
|
| Debt securities carried at fair value |
243,567
|
|
|
230,023
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
279,162
|
|
|
|
|
|
|
Tax-exempt securities [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
6,443
|
|
|
5,967
|
|
|
| Gross Unrealized Gains |
4
|
|
|
10
|
|
|
| Gross Unrealized Losses |
(33)
|
|
|
(49)
|
|
|
| Debt securities carried at fair value |
6,414
|
|
|
5,928
|
|
|
| Debt Securities Carried at Fair Value: |
|
|
|
|
|
|
| Debt Securities Carried at Fair Value |
6,414
|
|
|
|
|
|
|
Debt [Member]
|
|
|
|
|
|
|
| Available-for-sale Debt Securities: |
|
|
|
|
|
|
| Amortized Cost |
253,162
|
|
|
241,145
|
|
|
| Gross Unrealized Gains |
1,520
|
|
|
1,357
|
|
|
| Gross Unrealized Losses |
(4,701)
|
|
|
(6,551)
|
|
|
| Debt securities carried at fair value |
249,981
|
|
|
235,951
|
|
|
| In Text Details [Abstract] |
|
|
|
|
|
|
| Related Income Tax Benefit |
859
|
|
(535)
|
|
|
|
|
Debt [Member] | Available-for-sale debt securities [Member]
|
|
|
|
|
|
|
| In Text Details [Abstract] |
|
|
|
|
|
|
| Accumulated other comprehensive income (loss) |
(1,960)
|
|
3,497
|
(3,257)
|
|
4,443
|
|
Equity securities [Member]
|
|
|
|
|
|
|
| Available-for-sale Equity Securities: |
|
|
|
|
|
|
| Amortized Cost |
236
|
[4] |
|
230
|
[4] |
|
| Gross Unrealized Gains |
0
|
[4] |
|
0
|
[4] |
|
| Gross Unrealized Losses |
(20)
|
[4] |
|
(7)
|
[4] |
|
| Fair Value |
$ 216
|
[4] |
|
$ 223
|
[4] |
|
|
|
|