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Fair Value Measurements And Disclosure (Narrative) (Details)
€ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value Disclosures [Line Items]        
Collateral received from counterparty     $ 0 $ 44,000,000
Collateral submitted to counterparty     2,809,000,000 $ 204,000,000
Collateral contingently payable to the counterparty     0  
Available-for-sale Securities Debt Securities     1,514,000,000  
Fixed income investments - maturities less than 1 year     78,000,000  
Fixed income investments - maturities within 1 to 3 years     149,000,000  
Fixed income investments - maturities within 3 to 5 years     160,000,000  
Fixed income investments - maturities for 5 or more years     1,127,000,000  
Anticipated reclassification of holding losses during the next 12 months - cash flow hedges     60,000,000  
Net gains on net investment hedges recognized in accumulated OCI $ 25,000,000      
Measurement Input, Entity Credit Risk [Member]        
Fair Value Disclosures [Line Items]        
Collateral contingently payable to the counterparty     6,149,000,000  
DIRECTV [Member]        
Fair Value Disclosures [Line Items]        
Collateral contingently payable to the counterparty     $ 200,000,000  
WarnerMedia [Member] | Net Investment Hedge [Member]        
Fair Value Disclosures [Line Items]        
Debt Instrument, Face Amount | €   € 1,364