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Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized investment gains (losses) Net unrealized investment gains (losses) Net unrealized investment gains (losses)
Cash flow hedges in AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Balance, beginning $ 2,616 $ 1,019 $ (168)
Amount recorded in AOCI (1,571) 2,502 1,740
Amount reclassified from AOCI to income (176) (905) (553)
Ending Balance 869 2,616 1,019
Interest Rate | Cash flow hedges in AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amount recorded in AOCI (15) (224) (13)
Amount reclassified from AOCI to income 38 7 0
Currency | Cash flow hedges in AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amount recorded in AOCI (108) 206 44
Amount reclassified from AOCI to income (14) (15) 4
Currency/Interest Rate | Cash flow hedges in AOCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Amount recorded in AOCI (1,448) 2,520 1,709
Amount reclassified from AOCI to income $ (200) $ (897) $ (557)