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Equity (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net investment gains (losses) $ (96) $ (68)    
Net investment income 1,059 1,151    
Net derivative gains (losses) (575) (54) $ (592) $ (3,983)
Pre-tax adjusted earnings (653) 2,003    
Income tax (expense) benefit 156 (416)    
Net income (loss) (525) 1,558    
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income (loss) (50) (33)    
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) (68) (39)    
Net derivative gains (losses) 7 (4)    
Pre-tax adjusted earnings (61) (43)    
Income tax (expense) benefit 13 9    
Net income (loss) (48) (34)    
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 0 2    
Income tax (expense) benefit 0 (1)    
Net income (loss) 0 1    
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 1 1    
Net derivative gains (losses) 0 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) (1) 0    
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Pre-tax adjusted earnings (3) 0    
Income tax (expense) benefit 1 0    
Amortization of net actuarial gains (losses) (3) 0    
Amortization of defined benefit plans, net of income tax $ (2) $ 0