Reportable Segments (Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 22,653	$ 24,238
Assets of discontinued operations	3,517	4,596
Operating Segments [Member] | Entertainment [Member]
Segment Reporting Information [Line Items]
Assets	11,441	11,262
Operating Segments [Member] | Cable Networks [Member]
Segment Reporting Information [Line Items]
Assets	2,594	2,618
Operating Segments [Member] | Publishing [Member]
Segment Reporting Information [Line Items]
Assets	858	880
Operating Segments [Member] | Local Media [Member]
Segment Reporting Information [Line Items]
Assets	4,018	4,065
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Assets	$ 225	$ 817