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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized capital gains | $ 39 | $ 27 | $ 61 | $ 109
Income from continuing operations before income taxes | 530 | 181 | 1,586 | 301
Net investment income | 444 | 404 | 1,323 | 1,209
Income tax expense | 103 | 36 | 297 | 5
Income from discontinued operations, net of tax | 5 | 89 | 322 | 276
Net income | 432 | 234 | 1,611 | 572
Insurance operating costs and other expenses | 1,091 | 952 | 3,195 | 3,521
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net income | (15) | 40 | (52) | (356)
Net Unrealized Gain on Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized capital gains | (15) | 32 | (59) | 102
Income from continuing operations before income taxes | (15) | 32 | (59) | 102
Income tax expense | (3) | 11 | (12) | 36
Income from discontinued operations, net of tax | 0 | 13 | (2) | 53
Net income | (12) | 34 | (49) | 119
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 | 0 |  | 0 |
Income from discontinued operations, net of tax | 0 |  | 1 |
Net income | 0 |  | 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 | 7 | 8 | 25 | 32
Income tax expense | 1 | 3 | 5 | 11
Income from discontinued operations, net of tax | 0 | 7 | 5 | 19
Net income | 6 | 12 | 25 | 40
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 | 5 | 0
Amortization of actuarial loss | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Insurance operating costs and other expenses | (14) | (12) | (42) | (45)
Settlement loss | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Settlement loss |  | 0 |  | (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 | (12) | (10) | (37) | (792)
Income tax expense | (3) | (4) | (8) | (277)
Net income | (9) | (6) | (29) | (515)
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 | 0 | 1 | 5
Net investment income | $ 7 | $ 8 | $ 24 | $ 27

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