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Estimates (Accrued And Other Current Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Information [Abstract]    
Interest payable $ 552 $ 545
Customer advances and deposits 59 72
Accrued capital expenditures 1,006 769
Accrued wages and benefits 280 254
Taxes payable other than income taxes 108 201
Income taxes payable 180 0
Exchanges payable 154 208
Other 243 318
Accrued and other current liabilities $ 2,582 $ 2,367 [1]
[1] * As adjusted. See Note 2.