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Fair Value Measurements And Disclosure (Narrative) (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value Disclosures [Line Items]          
Collateral received from counterparty       $ 38 $ 103
Collateral submitted to counterparty       407 1,675
Collateral contingently payable to the counterparty       122  
Available-for-sale Securities Debt Securities       1,380 $ 870
Fixed income investments - maturities less than 1 year       102  
Fixed income investments - maturities within 1 to 3 years       177  
Fixed income investments - maturities within 3 to 5 years       164  
Fixed income investments - maturities for 5 or more years       937  
Anticipated reclassification of holding losses during the next 12 months - cash flow hedges       62  
Net gains on net investment hedges recognized in accumulated OCI $ 43 $ 43      
Measurement Input, Entity Credit Risk [Member]          
Fair Value Disclosures [Line Items]          
Collateral contingently payable to the counterparty       4,502  
Net Investment Hedge [Member]          
Fair Value Disclosures [Line Items]          
Debt Instrument, Face Amount | €     € 1,450    
DIRECTV [Member]          
Fair Value Disclosures [Line Items]          
Collateral contingently payable to the counterparty       $ 288