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Debt and Credit Facilities (Tables)
 12 Months Ended
Dec. 31, 2021
Long-term Debt, Unclassified [Abstract]  
Maturities Of Long-Term Debt Disclosures
Summary of Total Debt
Senior unsecured notes:
RateDue20212020
2.625%March 15, 2021$— $750 
1.125%November 30, 2023622 668 
0.600%December 1, 2023598 597 
3.375%May 15, 2024593 590 
0.250%December 3, 2024958 1,030 
1.150%June 15, 2025645 644 
3.375%November 1, 2025748 747 
3.500%March 15, 2026994 992 
2.125%November 30, 2027845 909 
3.650%March 7, 2028597 596 
0.750%March 1, 2029901 969 
1.950%June 15, 2030990 989 
2.625%November 30, 2030727 782 
1.000%December 3, 2031840 903 
4.100%April 1, 2043392 392 
4.375%May 15, 2044395 395 
4.625%March 15, 2046982 981 
2.900%June 15, 2050642 641 
Term loan— 400 
Other10 16 
Total debt$12,479 $13,991 
Less current maturities7 761 
Total long-term debt$12,472 $13,230 
Unamortized debt issuance costs$62 $71 
Borrowing capacity on existing facilities$2,162 $2,903 
Fair value of senior unsecured notes$13,391 $15,022