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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)

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