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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total $ 583 $ 532 $ 1,996 $ 1,468
Net Investment Income 650 492 1,740 1,290
Interest Expense 58 58 172 179
Income tax expense 101 73 360 268
Net income 482 459 1,636 1,200
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net income 37 7 67 74
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss 55 15 112 120
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total 55 15 112 120
Income tax expense 12 3 24 25
Net income 43 12 88 95
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 (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total 9 9 26 19
Income tax expense 2 2 5 4
Net income 7 7 21 15
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 11 9 31 19
Interest Expense (3) (2) (8) (4)
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 3 3
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Currency Swap [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net Investment Income   1   1
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 2 2 5 5
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Insurance operating costs and other expenses (19) (17) (58) (50)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Plan Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total (17) (15) (53) (45)
Income tax expense (4) (3) (11) (9)
Net income $ (13) $ (12) $ (42) $ (36)