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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Investment in partnerships | $ 917 | $ 874
Net operating losses | 527 | 406
Derivative instruments | 45 | 0
Lease liabilities | 39 | 55
Other | 16 | 16
Total deferred tax assets | 1,544 | 1,351
Deferred tax liabilities: |  |
Property and equipment in excess of tax values | (475) | (472)
Derivative instruments | 0 | (22)
Lease assets | (38) | (53)
Other | (3) | (5)
Total deferred tax liabilities | (516) | (552)
Net deferred tax assets | 1,028 | 799
Deferred tax asset | 1,444 | 1,280
Other long-term liabilities and deferred credits |  |
Deferred tax liabilities: |  |
Net deferred tax liabilities | (416) | (481)
Other long-term assets, net |  |
Deferred tax liabilities: |  |
Deferred tax asset | $ 1,444 | $ 1,280

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