v2.4.0.6
Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Comcast [Member]
Jun. 30, 2011
Comcast [Member]
Jun. 30, 2012
CCCL Parent [Member]
Jun. 30, 2011
CCCL Parent [Member]
Jun. 30, 2012
Combined CCHMO Parents [Member]
Jun. 30, 2011
Combined CCHMO Parents [Member]
Jun. 30, 2012
Comcast Holdings [Member]
Jun. 30, 2011
Comcast Holdings [Member]
Jun. 30, 2012
Comcast Non-Guarantor Subsidiaries [Member]
Jun. 30, 2011
Comcast Non-Guarantor Subsidiaries [Member]
Jun. 30, 2012
Elimination and Consolidation Adjustments [Member]
Jun. 30, 2011
Elimination and Consolidation Adjustments [Member]
Operating Activities                            
Net cash provided by (used in) operating activities $ 7,815 $ 6,956 $ (194) $ (291) $ (100) $ (4) $ (71) $ (66) $ 6 $ (12) $ 8,174 $ 7,329 $ 0 $ 0
Investing Activities                            
Net transactions with affiliates     3,317 1,640 100 1,004 624 66 (6) 32 (4,035) (2,742) 0 0
Capital expenditures (2,461) (2,377) (4) (3) 0 0 0 0 0 0 (2,457) (2,374) 0 0
Cash paid for intangible assets (414) (296) (4) 0 0 0 0 0 0 0 (410) (296) 0 0
Acquisitions, net of cash acquired 0 (5,660)   0   0   0   0   (5,660)   0
Proceeds from sales of businesses and investments 64 116 0 0 0 0 0 0 0 0 64 116 0 0
Purchases of investments (108) (46) 0 0 0 0 0 0 0 0 (108) (46) 0 0
Other 90 (23) 0 (50) 0 0 0 0 0 0 90 27 0 0
Net cash provided by (used in) investing activities (2,829) (8,286) 3,309 1,587 100 1,004 624 66 (6) 32 (6,856) (10,975) 0 0
Financing Activities                            
Proceeds from (repayments of) short-term borrowings, net (554) 741 (1) 747 0 0 0 0 0 0 (553) (6) 0 0
Proceeds from borrowings     0 0 0 0 0 0 0 0 0 0 0 0
Repurchases and repayments of debt (1,692) (1,764) (1,125) (750) 0 (1,000) (553) 0 0 0 (14) (14) 0 0
Repurchases and retirements of common stock (1,500) (1,050) (1,500) (1,050) 0 0 0 0 0 0 0 0 0 0
Dividends paid (741) (572) (741) (572) 0 0 0 0 0 0 0 0 0 0
Issuances of common stock 184 206 184 206 0 0 0 0 0 0 0 0 0 0
Distributions (to) from noncontrolling interests (233) (175) 0 77 0 0 0 0 0 0 (233) (252) 0 0
Other 31 (43) 68 46 0 0 0 0 0 (20) (37) (69) 0 0
Net cash provided by (used in) financing activities (4,505) (2,657) (3,115) (1,296) 0 (1,000) (553) 0 0 (20) (837) (341) 0 0
Increase (decrease) in cash and cash equivalents 481 (3,987) 0 0 0 0 0 0 0 0 481 (3,987) 0 0
Cash and cash equivalents, beginning of period 1,620 5,984                        
Cash and cash equivalents, end of period $ 2,101 $ 1,997 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 2,101 $ 1,997 $ 0 $ 0