v2.4.0.8
Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating Activities    
Net cash provided by (used in) operating activities $ 12,302,000,000 $ 11,679,000,000
Investing Activities    
Net transactions with affiliates 0 0
Capital expenditures (5,196,000,000) (4,593,000,000)
Cash paid for intangible assets (735,000,000) (694,000,000)
Acquisitions and construction of real estate properties (28,000,000) (1,705,000,000)
Acquisitions, net of cash acquired (477,000,000) (42,000,000)
Proceeds from sales of businesses and investments 622,000,000 655,000,000
Return of capital from investees 6,000,000 146,000,000
Purchases of investments (145,000,000) (1,177,000,000)
Other (127,000,000) 83,000,000
Net cash provided by (used in) investing activities (6,080,000,000) (7,327,000,000)
Financing Activities    
Proceeds from (repayments of) short-term borrowings, net (437,000,000) 395,000,000
Proceeds from borrowings 4,182,000,000 2,933,000,000
Repurchases and repayments of debt (3,172,000,000) (2,442,000,000)
Repurchases and retirements of common stock (2,250,000,000) (1,500,000,000)
Dividends paid (1,676,000,000) (1,454,000,000)
Issuances of common stock 33,000,000 35,000,000
Purchase of NBCUniversal noncontrolling common equity interest   (10,761,000,000)
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock (170,000,000) (164,000,000)
Settlement of Station Venture liability   (602,000,000)
Other 97,000,000 (140,000,000)
Net cash provided by (used in) financing activities (3,393,000,000) (13,700,000,000)
Increase (decrease) in cash and cash equivalents 2,829,000,000 (9,348,000,000)
Cash and cash equivalents, beginning of period 1,718,000,000 10,951,000,000
Cash and cash equivalents, end of period 4,547,000,000 1,603,000,000
Comcast Parent [Member]
   
Operating Activities    
Net cash provided by (used in) operating activities (433,000,000) (451,000,000)
Investing Activities    
Net transactions with affiliates 2,349,000,000 (116,000,000)
Capital expenditures (3,000,000) (3,000,000)
Cash paid for intangible assets (2,000,000) (1,000,000)
Acquisitions and construction of real estate properties 0 0
Acquisitions, net of cash acquired 0 0
Proceeds from sales of businesses and investments 0 0
Return of capital from investees 0 0
Purchases of investments (10,000,000) (8,000,000)
Other 0 0
Net cash provided by (used in) investing activities 2,334,000,000 (128,000,000)
Financing Activities    
Proceeds from (repayments of) short-term borrowings, net (1,350,000,000) 400,000,000
Proceeds from borrowings 4,180,000,000 2,933,000,000
Repurchases and repayments of debt (1,000,000,000) 0
Repurchases and retirements of common stock (2,250,000,000) (1,500,000,000)
Dividends paid (1,676,000,000) (1,454,000,000)
Issuances of common stock 33,000,000 35,000,000
Purchase of NBCUniversal noncontrolling common equity interest   0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock 0 0
Settlement of Station Venture liability   0
Other 162,000,000 165,000,000
Net cash provided by (used in) financing activities (1,901,000,000) 579,000,000
Increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period 0 0
Comcast Holdings [Member]
   
Operating Activities    
Net cash provided by (used in) operating activities 11,000,000 (7,000,000)
Investing Activities    
Net transactions with affiliates (11,000,000) 7,000,000
Capital expenditures 0 0
Cash paid for intangible assets 0 0
Acquisitions and construction of real estate properties 0 0
Acquisitions, net of cash acquired 0 0
Proceeds from sales of businesses and investments 0 0
Return of capital from investees 0 0
Purchases of investments 0 0
Other 0 0
Net cash provided by (used in) investing activities (11,000,000) 7,000,000
Financing Activities    
Proceeds from (repayments of) short-term borrowings, net 0 0
Proceeds from borrowings 0 0
Repurchases and repayments of debt 0 0
Repurchases and retirements of common stock 0 0
Dividends paid 0 0
Issuances of common stock 0 0
Purchase of NBCUniversal noncontrolling common equity interest   0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock 0 0
Settlement of Station Venture liability   0
Other 0 0
Net cash provided by (used in) financing activities 0 0
Increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period 0 0
CCCL Parent [Member]
   
Operating Activities    
Net cash provided by (used in) operating activities 84,000,000 (3,000,000)
Investing Activities    
Net transactions with affiliates (84,000,000) 2,100,000,000
Capital expenditures 0 0
Cash paid for intangible assets 0 0
Acquisitions and construction of real estate properties 0 0
Acquisitions, net of cash acquired 0 0
Proceeds from sales of businesses and investments 0 0
Return of capital from investees 0 0
Purchases of investments 0 0
Other 0 0
Net cash provided by (used in) investing activities (84,000,000) 2,100,000,000
Financing Activities    
Proceeds from (repayments of) short-term borrowings, net 0 0
Proceeds from borrowings 0 0
Repurchases and repayments of debt 0 (2,097,000,000)
Repurchases and retirements of common stock 0 0
Dividends paid 0 0
Issuances of common stock 0 0
Purchase of NBCUniversal noncontrolling common equity interest   0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock 0 0
Settlement of Station Venture liability   0
Other 0 0
Net cash provided by (used in) financing activities 0 (2,097,000,000)
Increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period 0 0
Combined CCHMO Parents [Member]
   
Operating Activities    
Net cash provided by (used in) operating activities (88,000,000) (99,000,000)
Investing Activities    
Net transactions with affiliates 88,000,000 337,000,000
Capital expenditures 0 0
Cash paid for intangible assets 0 0
Acquisitions and construction of real estate properties 0 0
Acquisitions, net of cash acquired 0 0
Proceeds from sales of businesses and investments 0 0
Return of capital from investees 0 0
Purchases of investments 0 0
Other 0 0
Net cash provided by (used in) investing activities 88,000,000 337,000,000
Financing Activities    
Proceeds from (repayments of) short-term borrowings, net 0 0
Proceeds from borrowings 0 0
Repurchases and repayments of debt 0 (238,000,000)
Repurchases and retirements of common stock 0 0
Dividends paid 0 0
Issuances of common stock 0 0
Purchase of NBCUniversal noncontrolling common equity interest   0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock 0 0
Settlement of Station Venture liability   0
Other 0 0
Net cash provided by (used in) financing activities 0 (238,000,000)
Increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period 0 0
NBCUniversal Media Parent [Member]
   
Operating Activities    
Net cash provided by (used in) operating activities (998,000,000) (767,000,000)
Investing Activities    
Net transactions with affiliates 1,761,000,000 (900,000,000)
Capital expenditures 0 0
Cash paid for intangible assets 0 0
Acquisitions and construction of real estate properties 0 0
Acquisitions, net of cash acquired 0 0
Proceeds from sales of businesses and investments 1,000,000 0
Return of capital from investees 0 128,000,000
Purchases of investments (6,000,000) (2,000,000)
Other 4,000,000 (20,000,000)
Net cash provided by (used in) investing activities 1,760,000,000 (794,000,000)
Financing Activities    
Proceeds from (repayments of) short-term borrowings, net 0 0
Proceeds from borrowings 0 0
Repurchases and repayments of debt (902,000,000) (88,000,000)
Repurchases and retirements of common stock 0 0
Dividends paid 0 0
Issuances of common stock 0 0
Purchase of NBCUniversal noncontrolling common equity interest   (3,200,000,000)
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock 0 0
Settlement of Station Venture liability   0
Other 0 (40,000,000)
Net cash provided by (used in) financing activities (902,000,000) (3,328,000,000)
Increase (decrease) in cash and cash equivalents (140,000,000) (4,889,000,000)
Cash and cash equivalents, beginning of period 336,000,000 5,129,000,000
Cash and cash equivalents, end of period 196,000,000 240,000,000
Comcast Non-Guarantor Subsidiaries [Member]
   
Operating Activities    
Net cash provided by (used in) operating activities 13,726,000,000 13,006,000,000
Investing Activities    
Net transactions with affiliates (4,103,000,000) (1,428,000,000)
Capital expenditures (5,193,000,000) (4,590,000,000)
Cash paid for intangible assets (733,000,000) (693,000,000)
Acquisitions and construction of real estate properties (28,000,000) (1,705,000,000)
Acquisitions, net of cash acquired (477,000,000) (42,000,000)
Proceeds from sales of businesses and investments 621,000,000 655,000,000
Return of capital from investees 6,000,000 18,000,000
Purchases of investments (129,000,000) (1,167,000,000)
Other (131,000,000) 103,000,000
Net cash provided by (used in) investing activities (10,167,000,000) (8,849,000,000)
Financing Activities    
Proceeds from (repayments of) short-term borrowings, net 913,000,000 (5,000,000)
Proceeds from borrowings 2,000,000 0
Repurchases and repayments of debt (1,270,000,000) (19,000,000)
Repurchases and retirements of common stock 0 0
Dividends paid 0 0
Issuances of common stock 0 0
Purchase of NBCUniversal noncontrolling common equity interest   (7,561,000,000)
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock (170,000,000) (164,000,000)
Settlement of Station Venture liability   (602,000,000)
Other (65,000,000) (265,000,000)
Net cash provided by (used in) financing activities (590,000,000) (8,616,000,000)
Increase (decrease) in cash and cash equivalents 2,969,000,000 (4,459,000,000)
Cash and cash equivalents, beginning of period 1,382,000,000 5,822,000,000
Cash and cash equivalents, end of period 4,351,000,000 1,363,000,000
Elimination and Consolidation Adjustments [Member]
   
Operating Activities    
Net cash provided by (used in) operating activities 0 0
Investing Activities    
Net transactions with affiliates 0 0
Capital expenditures 0 0
Cash paid for intangible assets 0 0
Acquisitions and construction of real estate properties 0 0
Acquisitions, net of cash acquired 0 0
Proceeds from sales of businesses and investments 0 0
Return of capital from investees 0 0
Purchases of investments 0 0
Other 0 0
Net cash provided by (used in) investing activities 0 0
Financing Activities    
Proceeds from (repayments of) short-term borrowings, net 0 0
Proceeds from borrowings 0 0
Repurchases and repayments of debt 0 0
Repurchases and retirements of common stock 0 0
Dividends paid 0 0
Issuances of common stock 0 0
Purchase of NBCUniversal noncontrolling common equity interest   0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock 0 0
Settlement of Station Venture liability   0
Other 0 0
Net cash provided by (used in) financing activities 0 0
Increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period $ 0 $ 0