Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Amount of Hedged Item	$ (819)	$ (485)	$ (748)	$ (495)
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
Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Derivatives Deferred In OCI	(50)	(18)
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:InterestExpenseOperating \| Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI	1	2
Income Statement Location [Axis]: us-gaap:InterestExpenseOperating \| Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI	0	0
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:NetInvestmentIncome \| Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI	0	1
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome \| Currency Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI	18	17
Income Statement Location [Axis]: us-gaap:OtherComprehensiveIncomeOtherNetOfTax
Derivative Instruments, Gain (Loss) [Line Items]
Cash Flow Derivatives Deferred In OCI	$ (88)	$ (6)