Film and Television Costs (Film and Television Costs) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Film Costs:
Released, less amortization	$ 1,573	$ 1,734
Completed, not released	242	50
In production and in development	1,010	1,149
Total film costs	2,825	2,933
Television Costs:
Released, less amortization	2,286	2,260
In production and in development	905	818
Total television costs	3,191	3,078
Programming rights, less amortization	2,584	2,689
Total film costs, television costs and programming rights	8,600	8,700
Less: Current portion of programming rights	1,223	1,613
Film and television costs	7,377	7,087
NBCUniversal Media LLC [Member]
Film Costs:
Released, less amortization	1,573	1,734
Completed, not released	242	50
In production and in development	1,010	1,149
Total film costs	2,825	2,933
Television Costs:
Released, less amortization	2,286	2,260
In production and in development	905	818
Total television costs	3,191	3,078
Programming rights, less amortization	2,566	2,677
Total film costs, television costs and programming rights	8,582	8,688
Less: Current portion of programming rights	1,213	1,606
Film and television costs	$ 7,369	$ 7,082