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Additional Financial Information (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Notes And Debentures [Member]    
Additional Financial Information [Line Items]    
Long-Term Debt Obligation $ 183,418  
Commercial paper 3,732  
Debt instrument - redemption amount 4,550  
Three-Year Floating Rate Notes [Member] | Minimum [Member]    
Additional Financial Information [Line Items]    
Proceeds from Issuance of Debt 5,250  
Six-Year Floating Rate Notes [Member] | Maximum [Member]    
Additional Financial Information [Line Items]    
Proceeds from Issuance of Debt 5,250  
Other Debt [Member]    
Additional Financial Information [Line Items]    
Proceeds from Issuance of Debt 6,925  
Debentures Subject to Mandatory Redemption [Member]    
Additional Financial Information [Line Items]    
Debt instrument - redemption amount 21,235  
JPMorgan Chase Bank, N.A. [Member] | Notes And Debentures [Member]    
Additional Financial Information [Line Items]    
Line of Credit - advances outstanding 6,175 $ 16,175
BNP Parabas [Member] | Notes And Debentures [Member]    
Additional Financial Information [Line Items]    
Line of Credit - advances outstanding 0 2,500
Bank of Nova Scotia [Member] | Notes And Debentures [Member]    
Additional Financial Information [Line Items]    
Line of Credit - advances outstanding 2,250 $ 2,250
Latin America [Member] | Other Debt [Member]    
Additional Financial Information [Line Items]    
Proceeds from Issuance of Debt 1,000  
Time Warner Inc. [Member]    
Additional Financial Information [Line Items]    
Debt Assumed in Acquisition 22,865  
Time Warner Inc. [Member] | Notes And Debentures [Member]    
Additional Financial Information [Line Items]    
Commercial paper 1,076  
Debt Assumed in Acquisition 2,000  
Time Warner Inc. [Member] | Term Credit Agreements [Member]    
Additional Financial Information [Line Items]    
Debt instrument - redemption amount $ 2,000