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Estimates (Accrued And Other Current Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Other Information [Abstract]    
Interest payable $ 571 $ 552
Customer advances and deposits 128 59
Accrued capital expenditures 1,030 1,006
Accrued wages and benefits 283 280
Taxes payable other than income taxes 256 288
Exchanges payable 112 154
Other 538 243
Accrued and other current liabilities $ 2,918 $ 2,582