Fair Value Disclosure (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Adjustments to capitalized film and stage play production costs | $ 42 | $ 26 | $ 167 |
| NBCUniversal Media LLC [Member] | |||
| Adjustments to capitalized film and stage play production costs | 42 | $ 26 | $ 167 |
| Contingent Consideration Settlement [Member] | |||
| Contingent Consideration, Amount of Settlement Payment | 450 | ||
| Gain related to contingent consideration settlement | 240 | ||
| Contractual Obligations [Member] | |||
| Carrying value of contractual obligation | 1,100 | ||
| Contractual Obligations [Member] | NBCUniversal Media LLC [Member] | |||
| Carrying value of contractual obligation | $ 1,100 | ||