Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) - Changes in OCI Components Before- and After-tax (Details)

v3.8.0.1
Accumulated Other Comprehensive Income (Loss) - Changes in OCI Components Before- and After-tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
After-tax      
Comprehensive income $ 18,438 $ 15,892 $ 15,800
Total other comprehensive income (loss)      
Before-tax      
Net change (1,023) (2,428) 521
Tax effect      
Net change 1,229 498 (631)
After-tax      
Comprehensive income 206 (1,930) (110)
Available-for-sale securities | Debt securities      
Before-tax      
Net increase (decrease) in fair value 202 (1,645) (1,564)
Net realized (gains) losses reclassified into earnings (214) (471) (1,057)
Net change (12) (2,116) (2,621)
Tax effect      
Net increase (decrease) in fair value 26 622 595
Net realized (gains) losses reclassified into earnings 77 179 401
Net change 103 801 996
After-tax      
Other comprehensive income (loss) before reclassification, net of tax 228 (1,023) (969)
Net realized (gains) losses reclassified into earnings (137) (292) (656)
Comprehensive income 91 (1,315) (1,625)
Available-for-sale securities | Debt securities | Gains on sales of debt securities      
Before-tax      
Net realized (gains) losses reclassified into earnings (255) (490) (1,138)
Tax effect      
Net realized (gains) losses reclassified into earnings 97 186 432
After-tax      
Net realized (gains) losses reclassified into earnings (158) (304) (706)
Available-for-sale securities | Debt securities | Other income      
Before-tax      
Net realized (gains) losses reclassified into earnings 41 19 81
Tax effect      
Net realized (gains) losses reclassified into earnings (20) (7) (31)
After-tax      
Net realized (gains) losses reclassified into earnings 21 12 50
Available-for-sale securities | Equity securities      
Before-tax      
Net increase (decrease) in fair value 38 (49) 72
Net realized (gains) losses reclassified into earnings (90) 0 0
Net change (52) (49) 72
Tax effect      
Net increase (decrease) in fair value (12) 19 (27)
Net realized (gains) losses reclassified into earnings 34 0 0
Net change 22 19 (27)
After-tax      
Other comprehensive income (loss) before reclassification, net of tax 26 (30) 45
Net realized (gains) losses reclassified into earnings (56) 0 0
Comprehensive income (30) (30) 45
Debit Valuation Adjustments      
Before-tax      
Net increase (decrease) in fair value (490) (271) 436
Net realized (gains) losses reclassified into earnings 42 17 556
Net change (448) (254) 992
Tax effect      
Net increase (decrease) in fair value 171 104 (166)
Net realized (gains) losses reclassified into earnings (16) (6) (211)
Net change 155 98 (377)
After-tax      
Other comprehensive income (loss) before reclassification, net of tax (319) (167) 270
Net realized (gains) losses reclassified into earnings 26 11 345
Comprehensive income (293) (156) 615
Derivatives      
Before-tax      
Net increase (decrease) in fair value (50) (299) 55
Net realized (gains) losses reclassified into earnings 179 585 883
Net change 129 286 938
Tax effect      
Net increase (decrease) in fair value 1 113 (22)
Net realized (gains) losses reclassified into earnings (66) (217) (332)
Net change (65) (104) (354)
After-tax      
Other comprehensive income (loss) before reclassification, net of tax (49) (186) 33
Net realized (gains) losses reclassified into earnings 113 368 551
Comprehensive income 64 182 584
Derivatives | Net interest income      
Before-tax      
Net realized (gains) losses reclassified into earnings 327 553 974
Tax effect      
Net realized (gains) losses reclassified into earnings (122) (205) (367)
After-tax      
Net realized (gains) losses reclassified into earnings 205 348 607
Derivatives | Personnel      
Before-tax      
Net realized (gains) losses reclassified into earnings (148) 32 (91)
Tax effect      
Net realized (gains) losses reclassified into earnings 56 (12) 35
After-tax      
Net realized (gains) losses reclassified into earnings (92) 20 (56)
Employee Benefit Plans      
Before-tax      
Net increase (decrease) in fair value 223 (921) 408
Net realized (gains) losses reclassified into earnings 179 97 169
Settlements, curtailments and other 3 15 1
Net change 405 (809) 578
Tax effect      
Net increase (decrease) in fair value (55) 329 (121)
Net realized (gains) losses reclassified into earnings (61) (36) (62)
Settlements, curtailments and other (1) (8) (1)
Net change (117) 285 (184)
After-tax      
Other comprehensive income (loss) before reclassification, net of tax 168 (592) 287
Net realized (gains) losses reclassified into earnings 118 61 107
Settlements, curtailments and other 2 7 0
Comprehensive income 288 (524) 394
Prior service cost      
Before-tax      
Net realized (gains) losses reclassified into earnings 4 5 5
Tax effect      
Net realized (gains) losses reclassified into earnings (1) (2) (2)
After-tax      
Net realized (gains) losses reclassified into earnings 3 3 3
Net actuarial losses      
Before-tax      
Net realized (gains) losses reclassified into earnings 175 92 164
Tax effect      
Net realized (gains) losses reclassified into earnings (60) (34) (60)
After-tax      
Net realized (gains) losses reclassified into earnings 115 58 104
Foreign currency      
Before-tax      
Net increase (decrease) in fair value (439) 514 600
Net realized (gains) losses reclassified into earnings (606) 0 (38)
Net change (1,045) 514 562
Tax effect      
Net increase (decrease) in fair value 430 (601) (723)
Net realized (gains) losses reclassified into earnings 701 0 38
Net change 1,131 (601) (685)
After-tax      
Other comprehensive income (loss) before reclassification, net of tax (9) (87) (123)
Net realized (gains) losses reclassified into earnings 95 0 0
Comprehensive income $ 86 $ (87) $ (123)