v3.26.1
Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]                
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) $ 25   $ 25     $ (6)    
Cash Flow Hedging [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative, Amount of Hedged Item (931) $ (473) (931) $ (473) $ (819) $ (748) $ (485) $ (495)
Cash Flow Derivatives Deferred In OCI 126 4 214 10        
Income Statement Location [Axis]: us-gaap:InterestExpenseOperating | Cash Flow Hedging [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI (2) (2) (3) (4)        
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome | Cash Flow Hedging [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI (16) (18) (34) (36)        
Income Statement Location [Axis]: us-gaap:OtherComprehensiveIncomeOtherNetOfTax | Cash Flow Hedging [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Cash Flow Derivatives Deferred In OCI $ 126 $ 4 $ 214 $ 10