v3.26.1
Derivative Instruments (Cash Flow Hedges) (Details) - Cash Flow Hedging [Member] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Cash Flow Derivatives Deferred In OCI $ 126 $ 4 $ 214 $ 10
Income Statement Location [Axis]: us-gaap:InterestExpenseOperating        
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        
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        
Derivative Instruments, Gain (Loss) [Line Items]        
Cash Flow Derivatives Deferred In OCI 126 4 214 10
Interest Rate Swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Cash Flow Derivatives Deferred In OCI (36) (64) (74) (52)
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 (2) (2) (3) (4)
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) 0 (2)
Currency Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Cash Flow Derivatives Deferred In OCI 90 (60) 140 (42)
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 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 $ (16) $ (17) $ (34) $ (34)