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Other Comprehensive Income (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning of year balance |  | $ 58,543 | $ 37,695 | $ 36,834
Other comprehensive income (loss) before reclassifications | $ (18) |  |  |
Other comprehensive income (loss) |  | 917 | 274 | 140
End of year balance |  | 64,170 | 58,543 | 37,695
Net unrealized investment gains (losses) |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning of year balance |  | 97 | 0 | 0
Other comprehensive income (loss) before reclassifications |  | 763 | 97 | 0
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | (86) | 0 | 0
Other comprehensive income (loss) |  | 677 | 97 | 0
End of year balance |  | 774 | 97 | 0
OCI before Reclass, pre-tax |  | 927 | 132 | 0
Amounts reclassified, pre-tax |  | (105) | 1 | 0
Foreign currency translation adjustments |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning of year balance |  | (158) | (129) | (127)
Other comprehensive income (loss) before reclassifications |  | 8 | (29) | (2)
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | 154 | 0 | 0
Other comprehensive income (loss) |  | 162 | (29) | (2)
End of year balance |  | 4 | (158) | (129)
Net cash flow hedges |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning of year balance |  | 312 | (15) | (5)
Adoption of new accounting standard |  |  | (3) |
Other comprehensive income (loss) before reclassifications |  | (18) | 344 | (11)
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | (15) | (14) | 1
Other comprehensive income (loss) |  | (33) | 330 | (10)
End of year balance |  | 279 | 312 | (15)
OCI before Reclass, pre-tax |  | (25) | 465 | (18)
Amounts reclassified, pre-tax |  | (20) | (19) | 2
Amount expected to be reclassified |  | 14 |  |
Pension and OPEB plans |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning of year balance |  | (149) | (21) | (173)
Adoption of new accounting standard |  |  | (4) |
Other comprehensive income (loss) before reclassifications |  | 120 | (132) | 0
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | (9) | 8 | 152
Other comprehensive income (loss) |  | 111 | (124) | 152
End of year balance |  | (38) | (149) | (21)
OCI before Reclass, pre-tax |  | 162 | (178) | 0
Amounts reclassified, pre-tax |  | (12) | 11 | 249
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |
Beginning of year balance |  | 102 | (165) | (305)
Adoption of new accounting standard |  |  | (7) |
End of year balance |  | $ 1,019 | $ 102 | $ (165)

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