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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning $ (1,082)    
Shareholders' other comprehensive income (loss), net of tax (390) $ 300 $ (132)
Accumulated other comprehensive income (loss), ending (1,711) (1,082)  
Securities and Derivatives [ Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning 383 365 425
Other comprehensive income (loss) before reclassifications, pre-tax (512) 34 (48)
Other comprehensive income (loss) before reclassifications, tax (expense) benefit 100 (19) 6
Other comprehensive income (loss) before reclassifications, after-tax (412) 15 (42)
Reclassification adjustment, tax (expense) benefit (13) 28 10
Reclassification adjustment, after-tax 47 (52) (18)
Shareholders' other comprehensive income (loss), net of tax (365) (37) (60)
Accumulated other comprehensive income (loss), ending 18 383 365
Securities and Derivatives [ Member] | Previously Reported [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning 328 365 425
Accumulated other comprehensive income (loss), ending   328 365
Securities and Derivatives [ Member] | Restatement Adjustment [Member] | Accounting Standards Update 2018-02 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning 65 0 0
Accumulated other comprehensive income (loss), ending   65 0
Securities and Derivatives [ Member] | Restatement Adjustment [Member] | Accounting Standards Update 2016-01 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning (4) 0 0
Accumulated other comprehensive income (loss), ending   (4) 0
Securities and Derivatives [ Member] | Restatement Adjustment [Member] | Accounting Standards Update 2017-12 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning (6) 0 0
Accumulated other comprehensive income (loss), ending   (6) 0
Securities and Derivatives [ Member] | Selling, general and administrative expenses [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassification adjustment, pre-tax 0 1 1
Securities and Derivatives [ Member] | Net Realized Investment Gains [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassification adjustment, pre-tax 60 (81) (29)
Translation of foreign currencies [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning (69) (369) (274)
Other comprehensive income (loss) before reclassifications, pre-tax (152) 309 (95)
Other comprehensive income (loss) before reclassifications, tax (expense) benefit 0 (5) 0
Other comprehensive income (loss) before reclassifications, after-tax (152) 304 (95)
Accumulated other comprehensive income (loss), ending (221) (69) (369)
Translation of foreign currencies [Member] | Previously Reported [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning (65) (369) (274)
Accumulated other comprehensive income (loss), ending   (65) (369)
Translation of foreign currencies [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2018-02 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning (4) 0 0
Accumulated other comprehensive income (loss), ending   (4) 0
Postretirement benefits liability [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning (1,635) (1,378) (1,401)
Other comprehensive income (loss) before reclassifications, pre-tax 93 (22) (29)
Other comprehensive income (loss) before reclassifications, tax (expense) benefit (20) 8 10
Other comprehensive income (loss) before reclassifications, after-tax 73 (14) (19)
Reclassification adjustment, tax (expense) benefit (15) (24) (22)
Reclassification adjustment, after-tax 54 47 42
Shareholders' other comprehensive income (loss), net of tax 127 33 23
Accumulated other comprehensive income (loss), ending (1,508) (1,635) (1,378)
Postretirement benefits liability [Member] | Previously Reported [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning (1,345) (1,378) (1,401)
Accumulated other comprehensive income (loss), ending   (1,345) (1,378)
Postretirement benefits liability [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2018-02 [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Accumulated other comprehensive income (loss), beginning (290) 0 0
Accumulated other comprehensive income (loss), ending   (290) 0
Reclassification adjustment for amortization of net losses from past experience and prior service costs [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassification adjustment, pre-tax 69 64 64
Reclassification adjustment for settlement losses [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassification adjustment, pre-tax $ 0 $ 7 $ 0