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Equity (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Realized investment gains (losses), net | $ 2,079 | $ 1,667
Other income | 282 | (2,591)
Total foreign currency translation adjustment |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Amounts reclassified from AOCI | (3) | 3
Net Unrealized Investment Gains (Losses) |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Amounts reclassified from AOCI | (1,366) | (546)
Total amortization of defined benefit pension items |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Amounts reclassified from AOCI | 67 | 70
Accumulated Other Comprehensive Income (Loss) |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Amounts reclassified from AOCI | (1,302) | (473)
Amounts reclassified from AOCI |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Realized investment gains (losses), net | 0 | (3)
Other income | 3 | 0
Amortization of defined benefit pension items: |  |
Prior service cost | (1) | (1)
Actuarial gain (loss) | (66) | (69)
Amounts reclassified from AOCI | Total foreign currency translation adjustment |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Amounts reclassified from AOCI | 3 | (3)
Amounts reclassified from AOCI | Net Unrealized Investment Gains (Losses) |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Amounts reclassified from AOCI | 1,366 | 546
Amounts reclassified from AOCI | Total amortization of defined benefit pension items |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Amounts reclassified from AOCI | (67) | (70)
Amounts reclassified from AOCI | Accumulated Other Comprehensive Income (Loss) |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Amounts reclassified from AOCI | 1,302 | 473
Amounts reclassified from AOCI | Net unrealized investment gains (losses) on available-for-sale securities |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Net unrealized investment gains (losses) | 1,216 | 158
Amounts reclassified from AOCI | Interest Rate | Cash flow hedges |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Net unrealized investment gains (losses) | 5 | (1)
Amounts reclassified from AOCI | Currency | Cash flow hedges |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Net unrealized investment gains (losses) | (1) | 1
Amounts reclassified from AOCI | Currency | Fair value hedges |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Net unrealized investment gains (losses) | (2) | 0
Amounts reclassified from AOCI | Currency/Interest rate | Cash flow hedges |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Net unrealized investment gains (losses) | $ 148 | $ 388

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