v3.7.0.1
Financial Data by Business Segment Financial Data by Business Segment (Reconciliation of Adjusted EBITDA from Segment to Consolidated Statements) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Adjusted EBITDA $ 7,032 $ 6,367
Depreciation (1,915) (1,785)
Amortization (587) (493)
Other income (expense) items, net (625) (554)
Income before income taxes 3,905 3,535
NBCUniversal Media LLC [Member]    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Adjusted EBITDA 2,017 1,622
Depreciation (231) (192)
Amortization (277) (222)
Other income (expense) items, net (144) (28)
Income before income taxes $ 1,365 $ 1,180