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Fair Value Measurements And Disclosure (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Fair Value Disclosures [Abstract]          
Available-for-sale debt securities   $ 1,524 $ 1,524   $ 1,444
Available-for-sale debt securities - maturities less than 1 year   62 62    
Available-for-sale debt securities - maturities within 1 to 3 years   155 155    
Available-for-sale debt securities - maturities within 3 to 5 years   163 163    
Available-for-sale debt securities - maturities for 5 or more years   1,144 1,144    
Fair Value, Option, Quantitative Disclosures [Line Items]          
Anticipated reclassification of holding losses during the next 12 months - cash flow hedges   95 95    
Net losses on net investment hedges recognized in accumulated OCI   70 75    
Collateral submitted to counterparty   485 485   204
Collateral received from counterparty   4 4   $ 44
Collateral contingently payable to the counterparty   25 25    
Measurement Input, Entity Credit Risk          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Collateral contingently payable to the counterparty   3,237 3,237    
Measurement Input, Entity Credit Risk | Communications | DirecTV          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Collateral contingently payable to the counterparty   $ 241 $ 241    
Net Investment Hedging          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Aggregate principal amount of debt | €       € 1,450,000,000  
Interest rate locks | Cash Flow Hedging          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Payment for hedge $ 731