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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Short-term debt and current maturities of long-term debt:    
Short-term debt and current maturities of long-term debt $ 338 $ 287
Finance lease and other financing obligations 181 137
Long-term debt:    
Long-term debt 22,122  
Unamortized discount and unamortized deferred financing costs (154) (160)
Finance lease and other financing obligations 454 247
Total long-term debt 21,630 21,612
Line of Credit | Term loan facility    
Long-term debt:    
Long-term debt 1,750 3,950
Line of Credit | Revolving credit facility    
Long-term debt:    
Long-term debt $ 2,251 174
Senior Notes | 2.7% senior notes due 2020    
Debt Instrument [Line Items]    
Interest rate, stated percentage 2.70%  
Long-term debt:    
Long-term debt $ 850 850
Senior Notes | 4.75% senior notes due 2021    
Debt Instrument [Line Items]    
Interest rate, stated percentage 4.75%  
Long-term debt:    
Long-term debt $ 400 400
Senior Notes | 3.5% senior notes due 2022    
Debt Instrument [Line Items]    
Interest rate, stated percentage 3.50%  
Long-term debt:    
Long-term debt $ 700 700
Senior Notes | 3.8% senior notes due 2023    
Debt Instrument [Line Items]    
Interest rate, stated percentage 3.80%  
Long-term debt:    
Long-term debt $ 1,000 1,000
Senior Notes | 0.375% senior notes due 2023    
Debt Instrument [Line Items]    
Interest rate, stated percentage 3.75%  
Long-term debt:    
Long-term debt $ 557 559
Senior Notes | 2.75% senior notes due 2024    
Debt Instrument [Line Items]    
Interest rate, stated percentage 2.75%  
Long-term debt:    
Long-term debt $ 2,000 2,000
Senior Notes | 3.85% senior notes due 2025    
Debt Instrument [Line Items]    
Interest rate, stated percentage 3.85%  
Long-term debt:    
Long-term debt $ 900 900
Senior Notes | 2.25% senior notes due 2025    
Debt Instrument [Line Items]    
Interest rate, stated percentage 2.25%  
Long-term debt:    
Long-term debt $ 654 687
Senior Notes | 3.2% senior notes due 2026    
Debt Instrument [Line Items]    
Interest rate, stated percentage 3.20%  
Long-term debt:    
Long-term debt $ 2,000 2,000
Senior Notes | 1.125% senior notes due 2027    
Debt Instrument [Line Items]    
Interest rate, stated percentage 1.125%  
Long-term debt:    
Long-term debt $ 557 559
Senior Notes | 4.2% senior notes due 2028    
Debt Instrument [Line Items]    
Interest rate, stated percentage 4.20%  
Long-term debt:    
Long-term debt $ 1,000 1,000
Senior Notes | 3.5% senior notes due 2029    
Debt Instrument [Line Items]    
Interest rate, stated percentage 3.50%  
Long-term debt:    
Long-term debt $ 3,000 3,000
Senior Notes | 1.625% senior notes due 2030    
Debt Instrument [Line Items]    
Interest rate, stated percentage 1.625%  
Long-term debt:    
Long-term debt $ 557 559
Senior Notes | 3.0% senior notes due 2031    
Debt Instrument [Line Items]    
Interest rate, stated percentage 3.00%  
Long-term debt:    
Long-term debt $ 654 687
Senior Notes | 4.4% senior notes due 2049    
Debt Instrument [Line Items]    
Interest rate, stated percentage 4.40%  
Long-term debt:    
Long-term debt $ 2,000 2,000
Receivable securitized loan    
Long-term debt:    
Long-term debt 500 500
Line of Credit    
Short-term debt and current maturities of long-term debt:    
Short-term debt and current maturities of long-term debt $ 157 $ 150