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Cash And Cash Equivalents Non-Cash Activities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Accrued capital expenditures $ 684 $ 1,202
Right-of-Use Assets Obtained in Exchange for Liabilities 130 73
Stock Issued During Period, Value, Dividend Reinvestment Plan $ 72 $ 100