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Fair Value Measurements And Disclosure (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Fair Value Disclosures [Abstract]      
Available-for-sale debt securities   $ 1,214 $ 1,132
Available-for-sale debt securities - maturities less than 1 year   39  
Available-for-sale debt securities - maturities within 1 to 3 years   192  
Available-for-sale debt securities - maturities within 3 to 5 years   167  
Available-for-sale debt securities - maturities for 5 or more years   816  
Fair Value, Option, Quantitative Disclosures [Line Items]      
Gain (Loss) recognized in accumulated OCI $ 1,857    
Anticipated reclassification of holding losses during the next 12 months - cash flow hedges   59  
Collateral submitted to counterparty   50 886
Collateral received from counterparty   0 $ 0
Collateral contingently payable to the counterparty   55  
Measurement Input, Entity Credit Risk      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Collateral contingently payable to the counterparty   $ 5,348