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Debt and lines of credit (Tables)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt outstanding is as follows:
June 30,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(54) (47) 
Total debt, including net unamortized discounts, premiums and issuance costs6,796  5,803  
Current portion of long-term debt(551) (500) 
Long-term debt$6,245  $5,303