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Consolidating Financial Statements (Details) - Consolidating Statement of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Consolidating Statement of Comprehensive Income        
Net income $ 524 $ 595 $ 1,193 $ 1,212
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income (298) 327 (1,501) 471
Changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income (12) 2 (14) 2
Net changes in benefit plan assets and obligations 21 17 43 34
Net changes in unrealized foreign currency translation (158) 48 (152) 89
Other comprehensive income (loss) before income taxes (447) 394 (1,624) 596
Income tax expense (benefit) (81) 123 (325) 185
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries (366) 271 (1,299) 411
Other comprehensive income (loss), net of taxes (366) 271 (1,299) 411
Comprehensive income (loss) 158 866 (106) 1,623
Reportable Legal Entities [Member] | TPC [Member]        
Consolidating Statement of Comprehensive Income        
Net income 458 438 1,009 946
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income (209) 296 (1,047) 389
Changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income (10) 1 (11) 2
Net changes in unrealized foreign currency translation (77) 14 (102) 39
Other comprehensive income (loss) before income taxes (296) 311 (1,160) 430
Income tax expense (benefit) (58) 102 (233) 139
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries (238) 209 (927) 291
Other comprehensive income (loss), net of taxes (238) 209 (927) 291
Comprehensive income (loss) 220 647 82 1,237
Reportable Legal Entities [Member] | Other Subsidiaries [Member]        
Consolidating Statement of Comprehensive Income        
Net income 120 162 288 306
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income (89) 85 (453) 129
Changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income (2) 1 (3)  
Net changes in benefit plan assets and obligations   (1)   (1)
Net changes in unrealized foreign currency translation (81) 34 (50) 50
Other comprehensive income (loss) before income taxes (172) 119 (506) 178
Income tax expense (benefit) (21) 33 (98) 49
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries (151) 86 (408) 129
Other comprehensive income (loss), net of taxes (151) 86 (408) 129
Comprehensive income (loss) (31) 248 (120) 435
Reportable Legal Entities [Member] | TRV [Member]        
Consolidating Statement of Comprehensive Income        
Net income 524 595 1,193 1,212
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income   (54) (1) (47)
Net changes in benefit plan assets and obligations 21 18 43 35
Other comprehensive income (loss) before income taxes 21 (36) 42 (12)
Income tax expense (benefit) (2) (12) 6 (3)
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 23 (24) 36 (9)
Other comprehensive income (loss) of subsidiaries (389) 295 (1,335) 420
Other comprehensive income (loss), net of taxes (366) 271 (1,299) 411
Comprehensive income (loss) 158 866 (106) 1,623
Eliminations [Member]        
Consolidating Statement of Comprehensive Income        
Net income (578) (600) (1,297) (1,252)
Other comprehensive income (loss) of subsidiaries 389 (295) 1,335 (420)
Other comprehensive income (loss), net of taxes 389 (295) 1,335 (420)
Comprehensive income (loss) $ (189) $ (895) $ 38 $ (1,672)