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Consolidating Financial Statements (Details) - Consolidating Statement of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Consolidating Statement of Comprehensive Income    
Net income $ 796 $ 669
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income 1,416 (1,203)
Changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income 5 (2)
Net changes in benefit plan assets and obligations 12 22
Net changes in unrealized foreign currency translation 50 6
Other comprehensive income (loss) before income taxes 1,483 (1,177)
Income tax expense (benefit) 306 (244)
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 1,177 (933)
Other comprehensive income (loss), net of taxes 1,177 (933)
Comprehensive income (loss) 1,973 (264)
Reportable Legal Entities [Member] | TPC [Member]    
Consolidating Statement of Comprehensive Income    
Net income 625 551
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income 979 (838)
Changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income 4 (1)
Net changes in unrealized foreign currency translation 19 (25)
Other comprehensive income (loss) before income taxes 1,002 (864)
Income tax expense (benefit) 208 (175)
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 794 (689)
Other comprehensive income (loss), net of taxes 794 (689)
Comprehensive income (loss) 1,419 (138)
Reportable Legal Entities [Member] | Other Subsidiaries [Member]    
Consolidating Statement of Comprehensive Income    
Net income 208 168
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income 435 (364)
Changes in net unrealized gains (losses) on investment securities having credit losses recognized in the consolidated statement of income 1 (1)
Net changes in unrealized foreign currency translation 31 31
Other comprehensive income (loss) before income taxes 467 (334)
Income tax expense (benefit) 93 (77)
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 374 (257)
Other comprehensive income (loss), net of taxes 374 (257)
Comprehensive income (loss) 582 (89)
Reportable Legal Entities [Member] | TRV [Member]    
Consolidating Statement of Comprehensive Income    
Net income 796 669
Changes in net unrealized gains (losses) on investment securities having no credit losses recognized in the consolidated statement of income 2 (1)
Net changes in benefit plan assets and obligations 12 22
Other comprehensive income (loss) before income taxes 14 21
Income tax expense (benefit) 5 8
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 9 13
Other comprehensive income (loss) of subsidiaries 1,168 (946)
Other comprehensive income (loss), net of taxes 1,177 (933)
Comprehensive income (loss) 1,973 (264)
Eliminations [Member]    
Consolidating Statement of Comprehensive Income    
Net income (833) (719)
Other comprehensive income (loss) of subsidiaries (1,168) 946
Other comprehensive income (loss), net of taxes (1,168) 946
Comprehensive income (loss) $ (2,001) $ 227