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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized capital gains | $ 52 | $ 57 | $ 22 | $ 82
Income from continuing operations before income taxes | 537 | (281) | 1,056 | 120
Net investment income | 428 | 395 | 879 | 805
Income tax expense (benefit) | 103 | (129) | 194 | (31)
Income from discontinued operations, net of tax | 148 | 112 | 317 | 187
Net income (loss) | 582 | (40) | 1,179 | 338
Insurance operating costs and other expenses | 1,067 | 1,650 | 2,104 | 2,569
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net income (loss) | (13) | (419) | (37) | (392)
Net Unrealized Gain on Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized capital gains | (6) | 56 | (44) | 71
Income from continuing operations before income taxes | (6) | 56 | (44) | 71
Income tax expense (benefit) | (1) | 20 | (9) | 25
Income from discontinued operations, net of tax | (5) | 26 | (2) | 39
Net income (loss) | (10) | 62 | (37) | 85
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized capital gains | 0 |  | 0 |
Income from continuing operations before income taxes | 0 |  | 0 |
Income tax expense (benefit) | 0 |  | 0 |
Income from discontinued operations, net of tax | 1 |  | 1 |
Net income (loss) | 1 |  | 1 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income from continuing operations before income taxes | 9 | 11 | 18 | 24
Income tax expense (benefit) | 2 | 4 | 4 | 8
Income from discontinued operations, net of tax | (1) | 7 | 5 | 11
Net income (loss) | 6 | 14 | 19 | 27
Amortization of prior service credit | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Insurance operating costs and other expenses | 2 | 2 | 3 | 3
Amortization of actuarial loss | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Insurance operating costs and other expenses | (15) | (16) | (28) | (32)
Settlement loss | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Settlement loss |  | (747) |  | (747)
Pension and Other Postretirement Plan Adjustments | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income from continuing operations before income taxes | (13) | (761) | (25) | (776)
Income tax expense (benefit) | (3) | (266) | (5) | (272)
Net income (loss) | (10) | (495) | (20) | (504)
Interest rate swaps | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized capital gains | 0 | 1 | 1 | 5
Net investment income | $ 9 | $ 10 | $ 17 | $ 19

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