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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