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Debt and Lines of Credit (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt outstanding is as follows:
December 31,
20202019
Notes due 2020 at 1.75%
$ $500 
Notes due 2021 at 2.75%
550 550 
Notes due 2022 at 1.85%
500 500 
Notes due 2023 at 2.25%
500 500 
Notes due 2024 at 2.625%
300 300 
Notes due 2025 at 1.375%
750 — 
Notes due 2027 at 2.90%
500 500 
Notes due 2029 at 2.25%
750 750 
Notes due 2030 at 1.75%
750 — 
Notes due 2039 at 3.875%
750 750 
Notes due 2048 at 4.15%
1,500 1,500 
Total debt6,850 5,850 
Net unamortized discounts, premiums and issuance costs(52)(47)
Total debt, including net unamortized discounts, premiums and issuance costs6,798 5,803 
Current portion of long-term debt(550)(500)
Long-term debt$6,248 $5,303