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Cash And Cash Equivalents Non-Cash Activities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Accrued capital expenditures $ 396 $ 742
Right-of-Use Assets Obtained in Exchange for Liabilities $ 10 $ 125