Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable – trade	$ 704	$ 763
Deferred revenue	501	436
Accrued liabilities:
Programming costs	2,123	1,940
Labor	1,166	1,374
Capital expenditures	1,059	1,227
Interest	1,090	1,083
Taxes and regulatory fees	614	555
Property and casualty	486	462
Operating lease liabilities	258	235
Other	1,035	792
Total accounts payable and accrued liabilities	$ 9,036	$ 8,867