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Consolidating Financial Statements (details) - Consolidating Statement of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Consolidating Statement of Comprehensive Income        
Net income $ 293 $ 716 $ 1,505 $ 2,071
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income (42) (455) 429 1,138
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income 2 6 4 23
Net changes in benefit plan assets and obligations (9) 16 25 50
Net changes in unrealized foreign currency translation 113 (31) 202 37
Other comprehensive income (loss) before income taxes 64 (464) 660 1,248
Income tax expense (benefit) 5 (159) 190 431
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 59 (305) 470 817
Other comprehensive income (loss), net of taxes 59 (305) 470 817
Comprehensive income 352 411 1,975 2,888
Reportable Legal Entities [Member] | TPC [Member]        
Consolidating Statement of Comprehensive Income        
Net income 295 538 1,241 1,565
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income   (323) 389 732
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income 1 4 3 12
Net changes in benefit plan assets and obligations   1   19
Net changes in unrealized foreign currency translation 61 (13) 100 106
Other comprehensive income (loss) before income taxes 62 (331) 492 869
Income tax expense (benefit) 12 (120) 151 277
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 50 (211) 341 592
Other comprehensive income (loss), net of taxes 50 (211) 341 592
Comprehensive income 345 327 1,582 2,157
Reportable Legal Entities [Member] | Other Subsidiaries [Member]        
Consolidating Statement of Comprehensive Income        
Net income 34 213 340 621
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income (47) (137) 82 397
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income 1 2 1 11
Net changes in benefit plan assets and obligations (1)   (2) 20
Net changes in unrealized foreign currency translation 52 (18) 102 (69)
Other comprehensive income (loss) before income taxes 5 (153) 183 359
Income tax expense (benefit) (11) (48) 38 144
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 16 (105) 145 215
Other comprehensive income (loss), net of taxes 16 (105) 145 215
Comprehensive income 50 108 485 836
Reportable Legal Entities [Member] | TRV [Member]        
Consolidating Statement of Comprehensive Income        
Net income 302 716 1,514 2,071
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income 5 5 (42) 9
Net changes in benefit plan assets and obligations (8) 15 27 11
Other comprehensive income (loss) before income taxes (3) 20 (15) 20
Income tax expense (benefit) 4 9 1 10
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries (7) 11 (16) 10
Other comprehensive income (loss) of subsidiaries 66 (316) 486 807
Other comprehensive income (loss), net of taxes 59 (305) 470 817
Comprehensive income 361 411 1,984 2,888
Eliminations [Member]        
Consolidating Statement of Comprehensive Income        
Net income (338) (751) (1,590) (2,186)
Other comprehensive income (loss) of subsidiaries (66) 316 (486) (807)
Other comprehensive income (loss), net of taxes (66) 316 (486) (807)
Comprehensive income $ (404) $ (435) $ (2,076) $ (2,993)