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Debt and Credit Facilities (Tables)
 3 Months Ended
Mar. 31, 2021
Long-term Debt, Unclassified [Abstract]  
Schedule of Long-term Debt Instruments
Summary of Total DebtMarch 2021December 2020
RateDue
Senior unsecured notes:
2.625%March 15, 2021$— $750 
1.125%November 30, 2023646 668 
0.600%December 1, 2023597 597 
3.375%May 15, 2024591 590 
0.250%December 3, 2024995 1,030 
1.150%June 15, 2025645 644 
3.375%November 1, 2025747 747 
3.500%March 15, 2026993 992 
2.125%November 30, 2027878 909 
3.650%March 7, 2028596 596 
0.750%March 1, 2029937 969 
1.950%June 15, 2030989 989 
2.625%November 30, 2030756 782 
1.000%December 3, 2031873 903 
4.100%April 1, 2043392 392 
4.375%May 15, 2044395 395 
4.625%March 15, 2046982 981 
2.900%June 15, 2050641 641 
Variable term loanNovember 10, 2023400 400 
Other21 16 
Total debt$13,074 $13,991 
Less current maturities of debt15 761 
Total long-term debt$13,059 $13,230 
March 2021December 2020
Unamortized debt issuance costs$69 $71 
Borrowing capacity on existing facilities$2,908 $2,903 
Fair value of senior unsecured notes$13,634 $15,022