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Derivatives and Hedging Instruments - Offsetting Derivative Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Derivative assets    
Gross Amounts $ 394 $ 282
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts 394 282
Gross Amounts not Offset in the Balance Sheet (29) (56)
Net $ 365 $ 226
DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag Derivative assets Derivative assets
Derivative liabilities    
Gross Amounts $ 31 $ 112
Gross Amounts Offset in the Balance Sheet 0 0
Net Amounts 31 112
Gross Amounts not Offset in the Balance Sheet (29) (56)
Net $ 2 $ 56
DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag Derivative liabilities Derivative liabilities