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Changes in and Reclassifications From Accumulated Other Comprehensive Income (Loss) - Reclassification from AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net investment income                 $ 1,846 $ 1,951 $ 1,780
Interest Expense                 236 259 298
Income from continuing operations before income taxes                 2,120 2,560 1,753
Income tax expense                 383 475 268
Income from discontinued operations, net of tax, available to common stockholders                 0 0 322
Net income $ 537 $ 459 $ 468 $ 273 $ 548 $ 535 $ 372 $ 630 1,737 2,085 1,807
Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net income                 109 111 (69)
Net Unrealized Gain on Fixed Maturities | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 171 174 (80)
Income from continuing operations before income taxes                 171 174 (80)
Income tax expense                 36 37 (17)
Income from discontinued operations, net of tax, available to common stockholders                 0 0 (2)
Net income                 135 137 (65)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 0    
Income from continuing operations before income taxes                 0    
Income tax expense                 0    
Income from discontinued operations, net of tax, available to common stockholders                 0    
Net income                 0    
Unrealized loss on Fixed Maturities with ACL | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                   0 0
Income from continuing operations before income taxes                   0 0
Income tax expense                   0 0
Income from discontinued operations, net of tax, available to common stockholders                   0 1
Net income                   0 1
Net Gain (Loss) on Cash Flow Hedging Instruments | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Income from continuing operations before income taxes                 26 10 36
Income tax expense                 5 2 8
Income from discontinued operations, net of tax, available to common stockholders                 0 0 5
Net income                 21 8 33
Net Gain (Loss) on Cash Flow Hedging Instruments | Amount Reclassified from AOCI | Interest rate swaps                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 0 2 6
Net investment income                 29 4 30
Interest Expense                 (7) 1 0
Net Gain (Loss) on Cash Flow Hedging Instruments | Amount Reclassified from AOCI | Foreign currency swaps                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net investment income                 5 3 0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Amount Reclassified from AOCI | Foreign currency swaps                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 (1) 0 0
Amortization of prior service credit | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Insurance operating costs and other expenses                 7 7 7
Amortization of actuarial loss | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Insurance operating costs and other expenses                 (67) (50) (55)
Pension and Other Postretirement Plan Adjustments | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Income from continuing operations before income taxes                 (60) (43) (48)
Income tax expense                 (13) (9) (10)
Net income                 $ (47) $ (34) $ (38)