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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized capital gains (losses) |  |  |  |  |  |  |  |  | $ 398 | $ (111) | $ 173
Net investment income |  |  |  |  |  |  |  |  | 1,951 | 1,780 | 1,603
Interest Expense |  |  |  |  |  |  |  |  | 259 | 298 | 316
Insurance operating costs and other expenses |  |  |  |  |  |  |  |  | 4,580 | 4,281 | 4,563
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 2,560 | 1,753 | 723
Income tax expense |  |  |  |  |  |  |  |  | 475 | 268 | 985
Income (loss) from discontinued operations, net of tax, available to common stockholders |  |  |  |  |  |  |  |  | 0 | 322 | (2,869)
Net income (loss) | $ 548 | $ 535 | $ 372 | $ 630 | $ 196 | $ 432 | $ 582 | $ 597 | 2,085 | 1,807 | (3,131)
Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 111 | (69) | (269)
Net Unrealized Gain on Securities | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized capital gains (losses) |  |  |  |  |  |  |  |  | 174 | (80) | 152
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 174 | (80) | 152
Income tax expense |  |  |  |  |  |  |  |  | 37 | (17) | 53
Income (loss) from discontinued operations, net of tax, available to common stockholders |  |  |  |  |  |  |  |  | 0 | (2) | 103
Net income (loss) |  |  |  |  |  |  |  |  | 137 | (65) | 202
OTTI Losses in OCI | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized capital gains (losses) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from discontinued operations, net of tax, available to common stockholders |  |  |  |  |  |  |  |  | 0 | 1 | 0
Net income (loss) |  |  |  |  |  |  |  |  | 0 | 1 | 0
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 |  |  |  |  |  |  |  |  | 10 | 36 | 42
Income tax expense |  |  |  |  |  |  |  |  | 2 | 8 | 15
Income (loss) from discontinued operations, net of tax, available to common stockholders |  |  |  |  |  |  |  |  | 0 | 5 | 23
Net income (loss) |  |  |  |  |  |  |  |  | 8 | 33 | 50
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) |  |  |  |  |  |  |  |  | 2 | 6 | 5
Net investment income |  |  |  |  |  |  |  |  | 4 | 30 | 37
Interest Expense |  |  |  |  |  |  |  |  | 1 | 0 | 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 |  |  |  |  |  |  |  |  | 3 | 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 |  |  |  |  |  |  |  |  | (50) | (55) | (61)
Settlement loss | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Insurance operating costs and other expenses |  |  |  |  |  |  |  |  | 0 | 0 | (747)
Pension and Other Postretirement Plan Adjustments | Amount Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | (43) | (48) | (801)
Income tax expense |  |  |  |  |  |  |  |  | (9) | (10) | (280)
Net income (loss) |  |  |  |  |  |  |  |  | $ (34) | $ (38) | $ (521)

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