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Fair Value Measurements And Disclosure (Narrative) (Details)
€ in Millions, $ in Millions
Mar. 31, 2019
EUR (€)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value Disclosures [Line Items]      
Collateral received from counterparty   $ 166 $ 103
Collateral submitted to counterparty   334 1,675
Collateral contingently payable to the counterparty   175  
Available-for-sale Securities Debt Securities   989 $ 870
Fixed income investments - maturities less than 1 year   46  
Fixed income investments - maturities within 1 to 3 years   178  
Fixed income investments - maturities within 3 to 5 years   98  
Fixed income investments - maturities for 5 or more years   667  
Anticipated reclassification of holding losses during the next 12 months - cash flow hedges   63  
Measurement Input, Entity Credit Risk [Member]      
Fair Value Disclosures [Line Items]      
Collateral contingently payable to the counterparty   1,360  
DIRECTV [Member]      
Fair Value Disclosures [Line Items]      
Collateral contingently payable to the counterparty   $ 258  
WarnerMedia [Member] | Net Investment Hedge [Member]      
Fair Value Disclosures [Line Items]      
Debt Instrument, Face Amount | € € 700