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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2018
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ 61,599 | $ 61,599 | $ 60,006 | $ 58,543 | $ 35,611 | $ 38,677 | $ 37,695 | $ 58,543 | $ 37,695 |
Other comprehensive income (loss) before reclassifications, net of tax |  | 18 |  |  |  |  |  |  |  |  |
Adoption of new accounting standard | [1] |  |  |  |  |  |  |  |  |  | $ (13)
Other comprehensive income (loss), net of tax |  |  | 266 | 251 | 331 | (12) | (31) | 344 | 848 | 301 |
Balance at end of period |  |  | 62,933 | 61,599 | 60,006 | 36,622 | 35,611 | 38,677 | 62,933 | 36,622 |
Net unrealized investment gains (losses) |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 682 | 682 |  | 97 | 0 |  | 0 | 97 | 0 |
Other comprehensive income (loss) before reclassifications, net of tax |  |  | 192 |  |  | 0 |  |  | 799 | 0 |
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | (56) |  |  | 0 |  |  | (78) | 0 |
Other comprehensive income (loss), net of tax |  |  | 136 |  |  | 0 |  |  | 721 | 0 |
Balance at end of period |  |  | 818 | 682 |  | 0 | 0 |  | 818 | 0 |
OCI before Reclass, pre-tax |  |  | 214 |  |  | 0 |  |  | 933 | 0 |
Amounts reclassified, pre-tax |  |  | (63) |  |  | 0 |  |  | (93) | 0 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | (154) | (154) |  | (158) | (155) |  | (129) | (158) | (129) |
Other comprehensive income (loss) before reclassifications, net of tax |  |  | (1) |  |  | (8) |  |  | 3 | (34) |
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | 154 |  |  | 0 |  |  | 154 | 0 |
Other comprehensive income (loss), net of tax |  |  | 153 |  |  | (8) |  |  | 157 | (34) |
Balance at end of period |  |  | (1) | (154) |  | (163) | (155) |  | (1) | (163) |
Net cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 305 | 305 |  | 312 | 321 |  | (15) | 312 | (15) |
Other comprehensive income (loss) before reclassifications, net of tax |  |  | (18) |  |  | 0 |  |  | (18) | 344 |
Amounts reclassified from accumulated other comprehensive loss, net of tax |  |  | (5) |  |  | (4) |  |  | (12) | (9) |
Adoption of new accounting standard |  |  |  |  |  |  |  |  |  |  | (3)
Other comprehensive income (loss), net of tax |  |  | (23) |  |  | (4) |  |  | (30) | 335 |
Balance at end of period |  |  | 282 | 305 |  | 317 | 321 |  | 282 | 317 |
Amount expected to be reclassified |  |  | 15 |  |  |  |  |  | 15 |  |
OCI before Reclass, pre-tax |  |  | (25) |  |  | 0 |  |  | (25) | 464 |
Amounts reclassified, pre-tax |  |  | (7) |  |  | (5) |  |  | (16) | (12) |
Pension and OPEB plans |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | (149) | (149) |  | (149) | (25) |  | (21) | (149) | (21) |
Adoption of new accounting standard |  |  |  |  |  |  |  |  |  |  | (4)
Balance at end of period |  |  | (149) | (149) |  | (25) | (25) |  | (149) | (25) |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ 684 | 684 |  | $ 102 | 141 |  | $ (165) | 102 | (165) |
Balance at end of period |  |  | $ 950 | $ 684 |  | $ 129 | $ 141 |  | $ 950 | $ 129 |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |
Adoption of new accounting standard |  |  |  |  |  |  |  |  |  |  | $ (7)
[1] | Reflects the adoption of Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers, which resulted in a reduction to retained earnings of $13 million and the adoption of ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which resulted in a reduction to accumulated other comprehensive income of $7 million and an increase to retained earnings of $7 million, each during the three months ended March 31, 2018.

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