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Estimates (Accrued And Other Current Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Other Information [Abstract]      
Interest payable $ 579   $ 571
Customer advances and deposits 123   128
Accrued capital expenditures 1,334   1,030
Accrued wages and benefits 217   283
Taxes payable other than income taxes 263   256
Exchanges payable 67   112
Other 759   538
Accrued and other current liabilities $ 3,342 $ 2,917 $ 2,918