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Cash And Cash Equivalents Non-Cash Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Accrued capital expenditures $ 559 $ 1,015
Dividends Payable 0 822
Lease assets obtained in exchange for new lease liabilities $ 14 $ 17