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Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Aug. 20, 2020
May 26, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying value of commercial paper $ 2,460     $ 1,311
Fair value of commercial paper 2,463      
Carrying value of other short-term debt 3     10
Fair value of other short-term debt 3      
Fair value of debt 18,409      
Total debt 17,332     7,819
2022 Term Loan        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 747      
Fair value of debt 750      
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 498      
Fair value of debt $ 518      
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 2.35%      
Carrying amount of debt $ 498     497
2023 Senior Notes (floating rate senior unsecured notes due June 15, 2023)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,244      
Fair value of debt 1,258      
2023 Senior Notes (floating rate senior unsecured notes due June 15, 2023) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,244     0
2023 Senior Notes (0.70% senior unsecured notes due June 15, 2023)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 994      
Fair value of debt $ 1,004      
2023 Senior Notes (0.70% senior unsecured notes due June 15, 2023) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 0.70% 0.70%    
Carrying amount of debt $ 994     0
2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 398      
Fair value of debt $ 433      
2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 3.45%      
Carrying amount of debt $ 398     398
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 795      
Fair value of debt $ 881      
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 4.00%      
Carrying amount of debt $ 795     794
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,245      
Fair value of debt $ 1,419      
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 3.75%      
Carrying amount of debt $ 1,245     1,244
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 496      
Fair value of debt $ 553      
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 3.10%      
Carrying amount of debt $ 496     496
2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 593      
Fair value of debt $ 696      
2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 3.75%      
Carrying amount of debt $ 593     592
2030 Senior Notes (2.10% senior unsecured notes due June 15, 2030)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,231      
Fair value of debt $ 1,293      
2030 Senior Notes (2.10% senior unsecured notes due June 15, 2030) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 2.10%   2.10%  
Carrying amount of debt $ 1,231     0
2032 Senior Notes (1.85% senior unsecured notes due September 15, 2032)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,481      
Fair value of debt $ 1,497      
2032 Senior Notes (1.85% senior unsecured notes due September 15, 2032) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 1.85% 1.85%    
Carrying amount of debt $ 1,481     0
2040 Senior Notes (2.65% senior unsecured notes due September 15, 2040)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,229      
Fair value of debt $ 1,253      
2040 Senior Notes (2.65% senior unsecured notes due September 15, 2040) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 2.65% 2.65%    
Carrying amount of debt $ 1,229     0
2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,230      
Fair value of debt $ 1,553      
2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 4.25%      
Carrying amount of debt $ 1,230     1,229
2050 Senior Notes (3.00% senior unsecured notes due June 15, 2050)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,219      
Fair value of debt $ 1,316      
2050 Senior Notes (3.00% senior unsecured notes due June 15, 2050) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 3.00%   3.00%  
Carrying amount of debt $ 1,219     0
2060 Senior Notes (3.00% senior unsecured notes due September 15, 2060)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Carrying amount of debt 1,469      
Fair value of debt $ 1,519      
2060 Senior Notes (3.00% senior unsecured notes due September 15, 2060) | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest rate, stated percentage 3.00% 3.00%    
Carrying amount of debt $ 1,469     $ 0