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Leases Components of balance sheet (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Impairment of right-of-use assets associated with operating leases | $ 191 | $ 139
Operating lease right-of-use assets (non-current) | 786 | 931
Current portion of operating lease liabliities | 251 | 208
Operating lease liabilities (non-current) | 758 | 825
Other assets |  |
Finance leases - Other assets (non-current) | 113 | 123
Other current liabilities |  |
Finance leases - Other current liabilities | 24 | 19
Other liabilities |  |
Finance leases - Other liabilities (non-current) | $ 118 | $ 124

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