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Cash And Cash Equivalents Non-Cash Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
NON-CASH INVESTING ACTIVITIES:    
Accrued capital expenditures $ 630 $ 1,011
Losses from subsidiary common unit transactions 0 (103)
Lease assets obtained in exchange for new lease liabilities $ 8 $ 0