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Derivative Instruments - Derivatives - Cash Flow Hedges (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net realized capital gains (losses) | $ 80 | $ (231)
Net Investment Income | 509 | 459
Interest Expense | 57 | 64
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net Investment Income | 10 | 3
Interest Expense | (2) |
Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net Investment Income | 1 | 1
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 14 | 60
Cash Flow Hedging | Designated as Hedging Instrument | Reclassification out of Accumulated Other Comprehensive Income | Net realized capital gains |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Reclassification out of Accumulated Other Comprehensive Income | Net investment income |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 11 | 4
Cash Flow Hedging | Designated as Hedging Instrument | Reclassification out of Accumulated Other Comprehensive Income | Interest expense |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | (2) | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 10 | 32
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net realized capital gains |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net investment income |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 10 | 3
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest expense |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | (2) | 0
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Recognized in OCI on Derivative (Effective Portion) | 4 | 28
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net realized capital gains |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 0 | 0
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Net investment income |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 1 | 1
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest expense |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | $ 0 | $ 0

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