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Estimates (Accrued And Other Current Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Information [Abstract]    
Interest payable $ 600 $ 579
Customer advances and deposits 161 123
Accrued capital expenditures 604 1,334
Accrued wages and benefits 109 217
Taxes payable other than income taxes 446 263
Exchanges payable 127 67
Other 728 759
Accrued and other current liabilities $ 2,775 $ 3,342