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Accumulated Other Comprehensive Income Loss - Reclassifications from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net Investment Income | $ 581 | $ 339 | $ 1,090 | $ 798
Interest Expense | 57 | 57 | 114 | 121
Income before income taxes | 1,110 | 592 | 1,413 | 936
Income tax expense | 205 | 124 | 259 | 195
Net income | 905 | 468 | 1,154 | 741
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net income | 33 | 34 | 30 | 67
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net realized capital gains | 53 | 52 | 57 | 105
Income before income taxes | 53 | 52 | 57 | 105
Income tax expense | 11 | 11 | 12 | 22
Net income | 42 | 41 | 45 | 83
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income before income taxes | 8 | 6 | 17 | 10
Income tax expense | 2 | 1 | 4 | 2
Net income | 6 | 5 | 13 | 8
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest rate swaps |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net Investment Income | 10 | 7 | 20 | 10
Interest Expense | (3) | (2) | (5) | (2)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Currency Swap [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net Investment Income | 1 | 1 | 2 | 2
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service credit |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Insurance operating costs and other expenses | 1 | 1 | 3 | 3
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Insurance operating costs and other expenses | (20) | (16) | (39) | (33)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Plan Adjustments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Income before income taxes | (19) | (15) | (36) | (30)
Income tax expense | (4) | (3) | (8) | (6)
Net income | $ (15) | $ (12) | $ (28) | $ (24)

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