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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Leases [Abstract] |  |
Operating lease right-of-use assets, net of amortization | $ 638 | $ 568
Other current liabilities | 190 | 178
Long-term operating lease liabilities | 470 | 403
Total operating lease liabilities | 660 | 581
Finance leases, net of amortization (within property, plant & equipment) | 252 | 122
Current portion of long-term debt | 74 | 32
Long-term debt | 182 | 91
Total finance lease liabilities | $ 256 | $ 123
Operating leases, weighted average remaining lease term | 6 years 3 months 18 days | 5 years 2 months 12 days
Finance leases, weighted average remaining lease term | 4 years 4 months 24 days | 4 years 7 months 6 days
Operating leases, weighted average discount rate | 3.20% | 3.50%
Finance leases, weighted average discount rate | 3.20% | 3.70%
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Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:LongTermDebtAndCapitalLeaseObligations | us-gaap:LongTermDebtAndCapitalLeaseObligations

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