v3.26.1
Derivative Instruments (Cash Flow Hedges) (Details) - Cash Flow Hedging [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivatives Deferred In OCI $ 88 $ 6
Income Statement Location [Axis]: us-gaap:InterestExpenseOperating    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI 1 2
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI 18 18
Income Statement Location [Axis]: us-gaap:OtherComprehensiveIncomeOtherNetOfTax    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivatives Deferred In OCI 88 6
Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivatives Deferred In OCI (38) (12)
Interest Rate Swaps | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI 1 2
Interest Rate Swaps | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI 0 1
Currency Swap [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivatives Deferred In OCI 50 18
Currency Swap [Member] | Income Statement Location [Axis]: us-gaap:InterestExpenseOperating    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI 0 0
Currency Swap [Member] | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI $ 18 $ 17