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Debt - Debt Covenants (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]      
Coverage ratio of debt-to-EBITDA, maximum 5.00    
Ratio of debt-to-EBITDA during acquisition period, maximum 5.50    
Threshold for acquisition period qualification $ 150    
Outstanding letters of credit 184 $ 166  
Credit agreements and commercial paper program      
Debt Instrument [Line Items]      
Total borrowings 45,400 60,800 $ 60,300
Total repayments $ 46,300 $ 61,500 $ 61,000
Letters of credit | Maximum      
Debt Instrument [Line Items]      
Periods for which letters of credit are issued 70 days