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Leases (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Lease, Cost [Abstract] |  |  |  |  |  |
Operating Lease Cost |  | $ 295 | $ 393 | [1] | $ 497 |
Amortization of Lease Assets |  | 39 | 21 |  | 13 |
Interest on Lease Liabilities |  | 7 | 4 |  | 2 |
Variable Lease Cost |  | 63 | 91 |  | 138 |
Short-term Lease Cost |  | 257 | 194 |  | 333 |
Total Lease Cost |  | 661 | 703 |  | 983 |
Operating Lease, Impairment Expense |  |  | 35 |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Total |  | 984 | 1,075 |  |  |
Current Portion of Operating Lease Liabilities |  | 240 | 295 |  |  |
Total |  | $ 1,048 | $ 1,148 |  |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  | Other Assets, Noncurrent | Other Assets, Noncurrent |  |  |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  | Property, Plant and Equipment, Gross | Property, Plant and Equipment, Gross |  |  |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  | Current Portion of Long-Term Debt | Current Portion of Long-Term Debt |  |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities | Other Liabilities |  |  |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Long-Term Debt | Long-Term Debt |  |  |
Cash Flow Operating And Financing Activities [Abstract] |  |  |  |  |  |
Repayment of Finance Lease Liabilities |  | $ 37 | $ 19 |  | 13 |
Operating Leases Non-Cash Leasing Activities |  | 333 | 893 |  | 784 |
Finance Leases Non-Cash Leasing Activities |  | 74 | 174 |  |  |
Operating And Finance Leases Future Minimum Payments [Abstract] |  |  |  |  |  |
Total Lease Liabilities |  | 250 | $ 212 |  |  |
Operating And Finance Leases Not Yet Commenced |  | $ 98 |  |  |  |
Minimum Operating And Finance Leases Not Yet Commenced Lease Term |  | 3 months |  |  |  |
Maximum Operating And Finance Leases Not Yet Commenced Lease Term |  | 9 years |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Other Assets |  |  |  |  |  | $ 566
Operating Leases |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Current Portion of Operating Lease Liabilities |  | $ 240 |  |  |  |
Other Liabilities |  | $ 558 |  |  |  |
Weighted Average Remaining Lease Term And Discount Rate [Abstract] |  |  |  |  |  |
Operating Lease Weighted Average Remaining Lease Term (in years) |  | 5 years 3 months 18 days | 5 years 3 months 18 days |  |  |
Operating Lease Weighted Average Discount Rate (%) |  | 3.00% | 3.40% |  |  |
Operating And Finance Leases Future Minimum Payments [Abstract] |  |  |  |  |  |
2022 |  | $ 262 |  |  |  |
2023 |  | 188 |  |  |  |
2024 |  | 113 |  |  |  |
2025 |  | 80 |  |  |  |
2026 |  | 59 |  |  |  |
2027 and Beyond |  | 172 |  |  |  |
Total Lease Payments |  | 874 |  |  |  |
Less: Discount to Present Value |  | 76 |  |  |  |
Total Lease Liabilities |  | 798 |  |  |  |
Operating Leases | Operating Activities |  |  |  |  |  |
Cash Flow Operating And Financing Activities [Abstract] |  |  |  |  |  |
Repayment of Operating Lease Liabilities Associated with Operating Activities |  | 207 | $ 223 |  | 225 |
Operating Leases | Investing Activities |  |  |  |  |  |
Cash Flow Operating And Financing Activities [Abstract] |  |  |  |  |  |
Repayment of Operating Lease Liabilities Associated with Operating Activities |  | 98 | $ 130 |  | 270 |
Finance Leases |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Current Portion of Long-Term Debt |  | 37 |  |  |  |
Long-Term Debt |  | $ 213 |  |  |  |
Weighted Average Remaining Lease Term And Discount Rate [Abstract] |  |  |  |  |  |
Finance Lease Weighted Average Remaining Lease Term (in years) |  | 7 years | 7 years 7 months 6 days |  |  |
Finance Lease Weighted Average Discount Rate (%) |  | 2.60% | 2.80% |  |  |
Cash Flow Operating And Financing Activities [Abstract] |  |  |  |  |  |
Repayment of Finance Lease Liabilities |  | $ 37 | $ 19 |  | $ 13 |
Operating And Finance Leases Future Minimum Payments [Abstract] |  |  |  |  |  |
2022 |  | 42 |  |  |  |
2023 |  | 37 |  |  |  |
2024 |  | 37 |  |  |  |
2025 |  | 36 |  |  |  |
2026 |  | 30 |  |  |  |
2027 and Beyond |  | 94 |  |  |  |
Total Lease Payments |  | 276 |  |  |  |
Less: Discount to Present Value |  | 26 |  |  |  |
Total Lease Liabilities |  | 250 |  |  |  |
Other Assets | Operating Leases |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Other Assets |  | 743 | 869 |  |  |
Property, Plant and Equipment | Finance Leases |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Net (1) | [2] | 241 | 206 |  |  |
Finance Lease, Right-of-Use Asset, Accumulated Amortization |  | 119 | 81 |  |  |
Current Portion of Operating Lease Liabilities | Operating Leases |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Current Portion of Operating Lease Liabilities |  | 240 | 295 |  |  |
Current Portion of Long-Term Debt | Finance Leases |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Current Portion of Long-Term Debt |  | 37 | 31 |  |  |
Other Liabilities | Operating Leases |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Other Liabilities |  | 558 | 641 |  |  |
Long-term Debt | Finance Leases |  |  |  |  |  |
Lease Assets and Liabilities [Abstract] |  |  |  |  |  |
Long-Term Debt |  | $ 213 | $ 181 |  |  |
[1] | Operating lease cost includes impairment expenses of $35 million in 2020.
[2] | Finance lease assets are recorded net of accumulated amortization of $119 million and $81 million at December 31, 2021 and 2020, respectively.

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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