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Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net investment gains (losses) $ (42) $ (96)
Net derivative gains (losses) (1,921) (575)
Net investment income 1,254 1,059
Pre-tax adjusted earnings (loss) (614) (653)
Income tax (expense) benefit 123 156
Net income (loss) (519) (525)
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income (loss) (28) (50)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized investment gains (losses):    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net investment gains (losses) (34) (68)
Net derivative gains (losses) (2) 7
Pre-tax adjusted earnings (loss) (36) (61)
Income tax (expense) benefit 7 13
Net income (loss) (29) (48)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Pre-tax adjusted earnings (loss) 3 0
Income tax (expense) benefit (1) 0
Net income (loss) 2 0
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives | Interest rate swaps    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net investment income 3 1
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives | Foreign currency swaps    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net derivative gains (losses) 0 (1)
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit plans adjustment:    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Pre-tax adjusted earnings (loss) (1) (3)
Income tax (expense) benefit 0 1
Amortization of net actuarial gains (losses) (1) (3)
Amortization of defined benefit plans, net of income tax $ (1) $ (2)