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Estimates (Schedule of Other Non-Current Assets, net) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Crude pipeline linefill and tank bottoms $ 517 $ 496
Regulatory assets 41 42
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 103 84
Deferred charges 188 178
Restricted funds 179 178
Other 629 593
Total other non-current assets, net $ 1,657 $ 1,571