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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts payable - trade $ 732 $ 740
Deferred revenue 486 395
Accrued liabilities:    
Programming costs 2,082 1,907
Labor 928 1,109
Capital expenditures 1,467 1,935
Interest 1,071 1,054
Taxes and regulatory fees 558 556
Property and casualty 420 408
Other 893 941
Total accounts payable and accrued liabilities $ 8,637 $ 9,045