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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net Investment Income $ 581 $ 339 $ 1,090 $ 798
Interest Expense 57 57 114 121
Income before income taxes 1,110 592 1,413 936
Income tax expense 205 124 259 195
Net income 905 468 1,154 741
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net income 33 34 30 67
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net realized capital gains 53 52 57 105
Income before income taxes 53 52 57 105
Income tax expense 11 11 12 22
Net income 42 41 45 83
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income before income taxes 8 6 17 10
Income tax expense 2 1 4 2
Net income 6 5 13 8
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest rate swaps        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net Investment Income 10 7 20 10
Interest Expense (3) (2) (5) (2)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Currency Swap [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net Investment Income 1 1 2 2
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Insurance operating costs and other expenses 1 1 3 3
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Insurance operating costs and other expenses (20) (16) (39) (33)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Plan Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income before income taxes (19) (15) (36) (30)
Income tax expense (4) (3) (8) (6)
Net income $ (15) $ (12) $ (28) $ (24)