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Debt and lines of credit - Schedule of Long-term Debt Outstanding (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 6,300 | $ 6,850
Net unamortized discounts, premiums and issuance costs | (49) | (52)
Total debt, including net unamortized discounts, premiums and issuance costs | 6,251 | 6,798
Current portion of long-term debt | (499) | (550)
Long-term debt | $ 5,752 | 6,248
Notes due 2021 at 2.75% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 2.75% |
Total debt | $ 0 | 550
Notes due 2022 at 1.85% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 1.85% |
Total debt | $ 500 | 500
Notes due 2023 at 2.25% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 2.25% |
Total debt | $ 500 | 500
Notes due 2024 at 2.625% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 2.625% |
Total debt | $ 300 | 300
Notes due 2025 at 1.375% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 1.375% |
Total debt | $ 750 | 750
Notes due 2027 at 2.90% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 2.90% |
Total debt | $ 500 | 500
Notes due 2029 at 2.25% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 2.25% |
Total debt | $ 750 | 750
Notes due 2030 at 1.75% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 1.75% |
Total debt | $ 750 | 750
Notes due 2039 at 3.875% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 3.875% |
Total debt | $ 750 | 750
Notes due 2048 at 4.15% |  |
Debt Instrument [Line Items] |  |
Long-term debt stated interest rate (in percentage) | 4.15% |
Total debt | $ 1,500 | $ 1,500

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