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Supplemental Financial Information (Net Cash Provided by Operating Activities)(Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net income $ 2,041 $ 2,633 $ 6,357 $ 6,596
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation and amortization 2,183 1,959 6,410 5,929
Share-based compensation     430 386
Noncash interest expense (income), net     147 132
Equity in net (income) losses of investees, net (1) (33) 202 (87)
Cash received from investees     139 71
Net (gain) loss on investment activity and other     (344) (24)
Deferred income taxes     67 358
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:        
Current and noncurrent receivables, net     (322) 89
Film and television costs, net     (65) (471)
Accounts payable and accrued expenses related to trade creditors (cash flow)     169 119
Other operating assets and liabilities     623 (796)
Net cash provided by operating activities     13,813 12,302
NBCUniversal Media, LLC [Member]        
Net income 962 833 2,824 2,416
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation and amortization 380 371 1,149 1,106
Equity in net (income) losses of investees, net $ 14 $ (20) 241 (49)
Cash received from investees     43 50
Net (gain) loss on investment activity and other     14 83
Deferred income taxes     (35) 52
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:        
Current and noncurrent receivables, net     (346) 7
Film and television costs, net     (74) (483)
Accounts payable and accrued expenses related to trade creditors (cash flow)     97 (183)
Other operating assets and liabilities     405 157
Net cash provided by operating activities     $ 4,318 $ 3,156