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Debt and Credit Facilities (Tables)
12 Months Ended
Dec. 31, 2020
Long-term Debt, Unclassified [Abstract]  
Maturities Of Long-Term Debt Disclosures
Summary of Total Debt
Senior unsecured notes:
RateDue20202019
4.375%January 15, 2020$— $500 
VariableNovember 30, 2020— 333 
2.625%March 15, 2021750 749 
1.125%November 30, 2023668 609 
0.600%December 1, 2023597 — 
3.375%May 15, 2024590 587 
0.250%December 3, 20241,030 938 
1.150%June 15, 2025644 — 
3.375%November 1, 2025747 746 
3.500%March 15, 2026992 991 
2.125%November 30, 2027909 829 
3.650%March 7, 2028596 596 
0.750%March 1, 2029969 884 
1.950%June 15, 2030989 — 
2.625%November 30, 2030782 712 
1.000%December 3, 2031903 823 
4.100%April 1, 2043392 391 
4.375%May 15, 2044395 395 
4.625%March 15, 2046981 981 
2.900%June 15, 2050641 — 
Term loan400 — 
Other16 26 
Total debt$13,991 $11,090 
Less current maturities761 859 
Total long-term debt$13,230 $10,231 
Unamortized debt issuance costs$71 $58 
Borrowing capacity on existing facilities$2,903 $1,546 
Fair value of senior unsecured notes$15,022 $11,910