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Estimates (Accrued And Other Current Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Other Information [Abstract]    
Interest payable $ 545 $ 519
Customer advances and deposits 72 114
Accrued capital expenditures 769 743
Accrued wages and benefits 254 218
Taxes payable other than income taxes 201 76
Exchanges payable 208 106
Other 318 632
Accrued and other current liabilities $ 2,367 $ 2,408