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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total $ 543 $ 303
Net Investment Income 509 509
Interest Expense 62 57
Income tax expense 98 54
Net income 445 249
Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net income (75) (3)
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 (87) 4
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total (87) 4
Income tax expense (18) 1
Net income (69) 3
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total 8 9
Income tax expense 2 2
Net income 6 7
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest rate swaps    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net Investment Income 9 10
Interest Expense (3) (2)
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 2 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
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Insurance operating costs and other expenses (17) (19)
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 (15) (17)
Income tax expense (3) (4)
Net income $ (12) $ (13)