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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
May 13, 2020
Dec. 31, 2019
Jul. 01, 2019
Jun. 24, 2019
Oct. 31, 2018
Sep. 30, 2018
Debt Instrument [Line Items]              
Interest rate, stated percentage           0.04625% 0.04625%
Short-term and current maturities of long-term debt:              
Short-term and current maturities of long-term debt $ 384   $ 287        
Finance lease and other financing obligations 240   137        
Long-term debt:              
Long-term debt 20,839            
Unamortized discount and deferred financing costs (155)   (160)        
Finance lease and other financing obligations 504   247        
Total long-term debt 20,300   21,612        
Line of Credit | Term loan facility              
Long-term debt:              
Long-term debt 1,250   3,950        
Line of Credit | Revolving credit facility              
Long-term debt:              
Long-term debt $ 22   174        
Senior notes | 2.700% senior notes due June 2020              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.70%            
Long-term debt:              
Long-term debt $ 0   850        
Senior notes | 4.750% senior notes due June 2021              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.75%            
Long-term debt:              
Long-term debt $ 400   400        
Senior notes | 3.500% senior notes due October 2022              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.50%            
Long-term debt:              
Long-term debt $ 700   700        
Senior notes | 3.800% senior notes due October 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 July 2023 (Euro-denominated)              
Debt Instrument [Line Items]              
Interest rate, stated percentage 0.375%     0.375%      
Long-term debt:              
Long-term debt $ 612   559        
Senior notes | 2.750% senior notes due July 2024              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.75%       2.75%    
Long-term debt:              
Long-term debt $ 2,000   2,000        
Senior notes | 3.850% senior notes due June 2025              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.85%            
Long-term debt:              
Long-term debt $ 900   900        
Senior notes | 2.250% senior notes due July 2025 (British Pound-denominated)              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.25%     2.25%      
Long-term debt:              
Long-term debt $ 709   687        
Senior notes | 3.200% senior notes due July 2026              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.20%            
Long-term debt:              
Long-term debt $ 2,000   2,000        
Senior notes | 2.250% senior notes due June 2027              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.25% 2.25%          
Long-term debt:              
Long-term debt $ 1,000   0        
Senior notes | 1.125% senior notes due July 2027 (Euro-denominated)              
Debt Instrument [Line Items]              
Interest rate, stated percentage 1.125%            
Long-term debt:              
Long-term debt $ 612   559        
Senior notes | 4.200% senior notes due October 2028              
Debt Instrument [Line Items]              
Interest rate, stated percentage             4.20%
Long-term debt:              
Long-term debt $ 1,000   1,000        
Senior notes | 3.500% senior notes due July 2029              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.50%            
Long-term debt:              
Long-term debt $ 3,000   3,000        
Senior notes | 2.650% senior notes due June 2030              
Debt Instrument [Line Items]              
Interest rate, stated percentage 2.65% 2.65%          
Long-term debt:              
Long-term debt $ 1,000   0        
Senior notes | 1.625% senior notes due July 2030 (Euro-denominated)              
Debt Instrument [Line Items]              
Interest rate, stated percentage 1.625%     1.625%      
Long-term debt:              
Long-term debt $ 612   559        
Senior notes | 3.000% senior notes due July 2031 (British Pound-denominated)              
Debt Instrument [Line Items]              
Interest rate, stated percentage 3.00%     3.00%      
Long-term debt:              
Long-term debt $ 709   687        
Senior notes | 4.400% senior notes due July 2049              
Debt Instrument [Line Items]              
Interest rate, stated percentage 4.40%       4.40%    
Long-term debt:              
Long-term debt $ 2,000   2,000        
Receivable securitized loan              
Long-term debt:              
Long-term debt 425   500        
Line of Credit              
Short-term and current maturities of long-term debt:              
Short-term and current maturities of long-term debt $ 144   $ 150