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Debt and Credit Facilities - (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Long-Term Debt
Long-Term Debt 
December 3120212020
3.5% senior notes due 2023
$ $323 
4.0% senior notes due 2024
585 583 
1.75% senior convertible notes due 2024
1,000 995 
6.5% debentures due 2025
70 70 
7.5% debentures due 2025
252 252 
4.6% senior notes due 2028
693 692 
6.5% debentures due 2028
24 24 
4.6% senior notes due 2029
803 803 
2.3% senior notes due 2030
893 892 
2.75% senior notes due 2031
844  
6.625% senior notes due 2037
38 37 
5.5% senior notes due 2044
396 396 
5.22% debentures due 2097
92 92 
Other long-term debt5 18 
5,695 5,177 
Adjustments for unamortized gains on interest rate swap terminations(2)(2)
Less: current portion(5)(12)
Long-term debt$5,688 $5,163