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Consolidating Financial Statements (Details) - Consolidating Statement of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Consolidating Statement of Comprehensive Income    
Net income $ 669 $ 617
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income (1,203) 144
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income (2)  
Net changes in benefit plan assets and obligations 22 17
Net changes in unrealized foreign currency translation 6 41
Other comprehensive income (loss) before income taxes (1,177) 202
Income tax expense (benefit) (244) 62
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries (933) 140
Other comprehensive income (loss), net of taxes (933) 140
Comprehensive income (loss) (264) 757
Reportable Legal Entities [Member] | TPC [Member]    
Consolidating Statement of Comprehensive Income    
Net income 551 508
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income (838) 93
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income (1) 1
Net changes in unrealized foreign currency translation (25) 25
Other comprehensive income (loss) before income taxes (864) 119
Income tax expense (benefit) (175) 37
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries (689) 82
Other comprehensive income (loss), net of taxes (689) 82
Comprehensive income (loss) (138) 590
Reportable Legal Entities [Member] | Other Subsidiaries [Member]    
Consolidating Statement of Comprehensive Income    
Net income 168 144
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income (364) 44
Changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income (1) (1)
Net changes in unrealized foreign currency translation 31 16
Other comprehensive income (loss) before income taxes (334) 59
Income tax expense (benefit) (77) 16
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries (257) 43
Other comprehensive income (loss), net of taxes (257) 43
Comprehensive income (loss) (89) 187
Reportable Legal Entities [Member] | TRV [Member]    
Consolidating Statement of Comprehensive Income    
Net income 669 617
Changes in net unrealized gains on investment securities having no credit losses recognized in the consolidated statement of income (1) 7
Net changes in benefit plan assets and obligations 22 17
Other comprehensive income (loss) before income taxes 21 24
Income tax expense (benefit) 8 9
Other comprehensive income (loss), net of taxes, before other comprehensive income (loss) of subsidiaries 13 15
Other comprehensive income (loss) of subsidiaries (946) 125
Other comprehensive income (loss), net of taxes (933) 140
Comprehensive income (loss) (264) 757
Eliminations [Member]    
Consolidating Statement of Comprehensive Income    
Net income (719) (652)
Other comprehensive income (loss) of subsidiaries 946 (125)
Other comprehensive income (loss), net of taxes 946 (125)
Comprehensive income (loss) $ 227 $ (777)