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Other Comprehensive Income (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |
Balance at beginning of period |  | $ 64,170 | $ 58,543
Other comprehensive income (loss) before reclassifications, net of tax | $ (5) |  |
Other comprehensive income (loss), net of tax |  | (332) | 331
Balance at end of period | 65,474 | 65,474 | 60,006
Net unrealized investment gains (losses) |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |
Balance at beginning of period |  | 774 | 97
Other comprehensive income (loss) before reclassifications, net of tax |  | (394) | 348
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | 83 | (14)
Other comprehensive income (loss), net of tax |  | (311) | 334
Balance at end of period | 463 | 463 | 431
OCI before Reclass, pre-tax |  | (486) | 410
Amounts reclassified, pre-tax |  | 101 | (19)
Foreign currency translation adjustments |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |
Balance at beginning of period |  | 4 | (158)
Other comprehensive income (loss) before reclassifications, net of tax |  | (12) | 1
Other comprehensive income (loss), net of tax |  | (12) | 1
Balance at end of period | (8) | (8) | (157)
Net cash flow hedges |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |
Balance at beginning of period |  | 279 | 312
Other comprehensive income (loss) before reclassifications, net of tax |  | (5) | 0
Amounts reclassified from accumulated other comprehensive loss, net of tax |  | (4) | (4)
Other comprehensive income (loss), net of tax |  | (9) | (4)
Balance at end of period | 270 | 270 | 308
Amount expected to be reclassified | 14 | 14 |
OCI before Reclass, pre-tax |  | (7) | 0
Amounts reclassified, pre-tax |  | (6) | (5)
Pension and OPEB plans |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |
Balance at beginning of period |  | (38) | (149)
Other comprehensive income (loss), net of tax |  | 0 | 0
Balance at end of period | (38) | (38) | (149)
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |
Balance at beginning of period |  | 1,019 | 102
Balance at end of period | $ 687 | $ 687 | $ 433

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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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