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Other Comprehensive Income (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ 68,355 | $ 65,474 | $ 64,170 | $ 61,599 | $ 60,006 | $ 58,543 | $ 64,170 | $ 58,543
Other comprehensive income (loss) before reclassifications, net of tax | $ (5) |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | 42 | 526 | (332) | 266 | 251 | 331 | 236 | 848
Balance at end of period | $ 65,474 | 69,112 | 68,355 | 65,474 | 62,933 | 61,599 | 60,006 | 69,112 | 62,933
Net unrealized investment gains (losses) |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 987 |  | 774 | 682 |  | 97 | 774 | 97
Other comprehensive income (loss) before reclassifications, net of tax |  | 52 |  |  | 192 |  |  | 218 | 799
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | (8) |  |  | (56) |  |  | 39 | (78)
Other comprehensive income (loss), net of tax |  | 44 |  |  | 136 |  |  | 257 | 721
Balance at end of period |  | 1,031 | 987 |  | 818 | 682 |  | 1,031 | 818
OCI before Reclass, pre-tax |  | 83 |  |  | 214 |  |  | 278 | 933
Amounts reclassified, pre-tax |  | (10) |  |  | (63) |  |  | 47 | (93)
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | (2) |  | 4 | (154) |  | (158) | 4 | (158)
Other comprehensive income (loss) before reclassifications, net of tax |  | 1 |  |  | (1) |  |  | (5) | 3
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | 0 |  |  | 154 |  |  | 0 | 154
Other comprehensive income (loss), net of tax |  | 1 |  |  | 153 |  |  | (5) | 157
Balance at end of period |  | (1) | (2) |  | (1) | (154) |  | (1) | (1)
Net cash flow hedges |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 267 |  | 279 | 305 |  | 312 | 279 | 312
Other comprehensive income (loss) before reclassifications, net of tax |  | 0 |  |  | (18) |  |  | (5) | (18)
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | (3) |  |  | (5) |  |  | (10) | (12)
Other comprehensive income (loss), net of tax |  | (3) |  |  | (23) |  |  | (15) | (30)
Balance at end of period |  | 264 | 267 |  | 282 | 305 |  | 264 | 282
Amount expected to be reclassified |  | 15 |  |  |  |  |  | 15 |
OCI before Reclass, pre-tax |  | 0 |  |  | (25) |  |  | (7) | (25)
Amounts reclassified, pre-tax |  | (4) |  |  | (7) |  |  | (14) | (16)
Pension and OPEB plans |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | (39) |  | (38) | (149) |  | (149) | (38) | (149)
Other comprehensive income (loss) before reclassifications, net of tax |  | 0 |  |  | 0 |  |  | (6) | 0
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | 0 |  |  | 0 |  |  | 5 | 0
Other comprehensive income (loss), net of tax |  | 0 |  |  | 0 |  |  | (1) | 0
Balance at end of period |  | (39) | (39) |  | (149) | (149) |  | (39) | (149)
OCI before Reclass, pre-tax |  | 0 |  |  | 0 |  |  | (8) | 0
Amounts reclassified, pre-tax |  | 0 |  |  | 0 |  |  | 7 | 0
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 1,213 |  | $ 1,019 | 684 |  | $ 102 | 1,019 | 102
Balance at end of period |  | $ 1,255 | $ 1,213 |  | $ 950 | $ 684 |  | $ 1,255 | $ 950

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