v3.19.3.a.u2
Fair Value Measurements And Disclosure (Narrative) (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value Disclosures [Line Items]        
Collateral received from counterparty     $ 44 $ 103
Collateral submitted to counterparty     204 $ 1,675
Collateral contingently payable to the counterparty     35  
Debt Instrument, Face Amount     17,235  
Available-for-sale Securities     1,444  
Fixed income investments - maturities under 1 year     54  
Fixed income investments - maturities between 1 to 3 years     172  
Fixed income investments - maturities between 3 to 5 years     161  
Fixed income investments - maturities for 5 or more years     1,057  
Anticipated reclassification of holding gains (losses) during the next 12 months - cash flow hedges     61  
Net gains on net investment hedges recognized in accumulated OCI $ 4      
Measurement Input, Entity Credit Risk [Member]        
Fair Value Disclosures [Line Items]        
Collateral contingently payable to the counterparty     2,678  
DIRECTV [Member]        
Fair Value Disclosures [Line Items]        
Collateral contingently payable to the counterparty     $ 232  
WarnerMedia [Member] | Net Investment Hedge [Member]        
Fair Value Disclosures [Line Items]        
Debt Instrument, Face Amount | €   € 1,450