v3.26.1
Equity (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Realized investment gains (losses), net [1] $ (364) $ (730)
Other Income [1] 30 280
Total foreign currency translation adjustment    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Amounts reclassified from AOCI (10) (12)
Total net unrealized investment gains (losses)    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Amounts reclassified from AOCI 603 98
Total amortization of defined benefit items    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Amounts reclassified from AOCI 18 7
Accumulated Other Comprehensive Income (Loss)    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Amounts reclassified from AOCI 611 93
Amounts reclassified from AOCI    
Amortization of defined benefit items:    
Prior service cost 17 17
Actuarial gain (loss) (35) (24)
Amounts reclassified from AOCI | Total foreign currency translation adjustment    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Realized investment gains (losses), net 10 12
Other Income 0 0
Amounts reclassified from AOCI 10 12
Amounts reclassified from AOCI | Total net unrealized investment gains (losses)    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Amounts reclassified from AOCI (603) (98)
Amounts reclassified from AOCI | Total amortization of defined benefit items    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Amounts reclassified from AOCI (18) (7)
Amounts reclassified from AOCI | Accumulated Other Comprehensive Income (Loss)    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Amounts reclassified from AOCI (611) (93)
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) (744) (64)
Amounts reclassified from AOCI | Interest Rate | Cash Flow Hedging    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Net unrealized investment gains (losses) (2) (3)
Amounts reclassified from AOCI | Currency | Cash Flow Hedging    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Net unrealized investment gains (losses) (3) 1
Amounts reclassified from AOCI | Currency | Fair Value Hedging    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Net unrealized investment gains (losses) (4) (3)
Amounts reclassified from AOCI | Currency/Interest rate | Cash Flow Hedging    
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Net unrealized investment gains (losses) $ 150 $ (29)
[1] See Note 20 for additional information regarding related party transactions.