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Fair Value Measurements And Disclosure (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Fair Value Disclosures [Abstract]    
Available-for-sale debt securities $ 1,142 $ 1,380
Available-for-sale debt securities - maturities less than 1 year 71  
Available-for-sale debt securities - maturities within 1 to 3 years 140  
Available-for-sale debt securities - maturities within 3 to 5 years 187  
Available-for-sale debt securities - maturities for 5 or more years 744  
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 1,767 135
Collateral received from counterparty 0 $ 7
Collateral contingently payable to the counterparty 23  
Measurement Input, Entity Credit Risk    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Collateral contingently payable to the counterparty $ 7,811