Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions |
Sep. 30, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Dec. 31, 2013 |
| Assets |
|
|
|
|
| Cash and cash equivalents |
$ 1,893
|
$ 3,910
|
$ 4,547
|
$ 1,718
|
| Investments [Current] |
137
|
602
|
|
|
| Receivables, net |
6,527
|
6,321
|
|
|
| Programming rights |
1,130
|
839
|
|
|
| Other current assets |
1,814
|
1,859
|
|
|
| Total current assets |
11,501
|
13,531
|
|
|
| Film and television costs |
5,712
|
5,727
|
|
|
| Investments |
3,323
|
3,135
|
|
|
| Investments in and amounts due from subsidiaries eliminated upon consolidation |
0
|
0
|
|
|
| Property and equipment, net |
32,170
|
30,953
|
|
|
| Franchise rights |
59,364
|
59,364
|
|
|
| Goodwill |
27,492
|
27,316
|
|
|
| Other intangible assets, net |
16,896
|
16,980
|
|
|
| Other noncurrent assets, net |
2,500
|
2,333
|
|
|
| Total assets |
158,958
|
159,339
|
|
|
| Liabilities and Equity |
|
|
|
|
| Accounts payable and accrued expenses related to trade creditors |
5,996
|
5,638
|
|
|
| Accrued participations and residuals |
1,491
|
1,347
|
|
|
| Accrued expenses and other current liabilities [condensed] |
6,720
|
6,208
|
|
|
| Current portion of long-term debt |
3,152
|
4,217
|
|
|
| Total current liabilities |
17,359
|
17,410
|
|
|
| Long-term debt, less current portion |
44,605
|
44,017
|
|
|
| Deferred income taxes |
33,131
|
32,959
|
|
|
| Other noncurrent liabilities |
10,694
|
10,819
|
|
|
| Redeemable noncontrolling interests and redeemable subsidiary preferred stock |
1,204
|
1,066
|
|
|
| Equity: |
|
|
|
|
| Common stock |
29
|
30
|
|
|
| Other shareholders' equity |
51,687
|
52,681
|
|
|
| Total Comcast Corporation shareholders' equity |
51,716
|
52,711
|
|
|
| Noncontrolling interests |
249
|
357
|
|
|
| Total equity |
51,965
|
53,068
|
53,653
|
51,058
|
| Total liabilities and equity |
158,958
|
159,339
|
|
|
| Comcast Parent [Member] |
|
|
|
|
| Assets |
|
|
|
|
| Cash and cash equivalents |
0
|
0
|
0
|
0
|
| Investments [Current] |
0
|
0
|
|
|
| Receivables, net |
0
|
0
|
|
|
| Programming rights |
0
|
0
|
|
|
| Other current assets |
342
|
267
|
|
|
| Total current assets |
342
|
267
|
|
|
| Film and television costs |
0
|
0
|
|
|
| Investments |
30
|
36
|
|
|
| Investments in and amounts due from subsidiaries eliminated upon consolidation |
84,507
|
84,142
|
|
|
| Property and equipment, net |
204
|
199
|
|
|
| Franchise rights |
0
|
0
|
|
|
| Goodwill |
0
|
0
|
|
|
| Other intangible assets, net |
11
|
11
|
|
|
| Other noncurrent assets, net |
1,248
|
1,224
|
|
|
| Total assets |
86,342
|
85,879
|
|
|
| Liabilities and Equity |
|
|
|
|
| Accounts payable and accrued expenses related to trade creditors |
8
|
19
|
|
|
| Accrued participations and residuals |
0
|
0
|
|
|
| Accrued expenses and other current liabilities [condensed] |
1,634
|
1,547
|
|
|
| Current portion of long-term debt |
750
|
1,650
|
|
|
| Total current liabilities |
2,392
|
3,216
|
|
|
| Long-term debt, less current portion |
29,829
|
27,616
|
|
|
| Deferred income taxes |
0
|
0
|
|
|
| Other noncurrent liabilities |
2,405
|
2,336
|
|
|
| Redeemable noncontrolling interests and redeemable subsidiary preferred stock |
0
|
0
|
|
|
| Equity: |
|
|
|
|
| Common stock |
29
|
30
|
|
|
| Other shareholders' equity |
51,687
|
52,681
|
|
|
| Total Comcast Corporation shareholders' equity |
51,716
|
52,711
|
|
|
| Noncontrolling interests |
0
|
0
|
|
|
| Total equity |
51,716
|
52,711
|
|
|
| Total liabilities and equity |
86,342
|
85,879
|
|
|
| Comcast Holdings [Member] |
|
|
|
|
| Assets |
|
|
|
|
| Cash and cash equivalents |
0
|
0
|
0
|
0
|
| Investments [Current] |
0
|
0
|
|
|
| Receivables, net |
0
|
0
|
|
|
| Programming rights |
0
|
0
|
|
|
| Other current assets |
0
|
0
|
|
|
| Total current assets |
0
|
0
|
|
|
| Film and television costs |
0
|
0
|
|
|
| Investments |
0
|
0
|
|
|
| Investments in and amounts due from subsidiaries eliminated upon consolidation |
109,269
|
103,420
|
|
|
| Property and equipment, net |
0
|
0
|
|
|
| Franchise rights |
0
|
0
|
|
|
| Goodwill |
0
|
0
|
|
|
| Other intangible assets, net |
0
|
0
|
|
|
| Other noncurrent assets, net |
149
|
148
|
|
|
| Total assets |
109,418
|
103,568
|
|
|
| Liabilities and Equity |
|
|
|
|
| Accounts payable and accrued expenses related to trade creditors |
0
|
0
|
|
|
| Accrued participations and residuals |
0
|
0
|
|
|
| Accrued expenses and other current liabilities [condensed] |
335
|
283
|
|
|
| Current portion of long-term debt |
0
|
0
|
|
|
| Total current liabilities |
335
|
283
|
|
|
| Long-term debt, less current portion |
133
|
126
|
|
|
| Deferred income taxes |
642
|
701
|
|
|
| Other noncurrent liabilities |
0
|
0
|
|
|
| Redeemable noncontrolling interests and redeemable subsidiary preferred stock |
0
|
0
|
|
|
| Equity: |
|
|
|
|
| Common stock |
0
|
0
|
|
|
| Other shareholders' equity |
108,308
|
102,458
|
|
|
| Total Comcast Corporation shareholders' equity |
108,308
|
102,458
|
|
|
| Noncontrolling interests |
0
|
0
|
|
|
| Total equity |
108,308
|
102,458
|
|
|
| Total liabilities and equity |
109,418
|
103,568
|
|
|
| CCCL Parent [Member] |
|
|
|
|
| Assets |
|
|
|
|
| Cash and cash equivalents |
0
|
0
|
0
|
0
|
| Investments [Current] |
0
|
0
|
|
|
| Receivables, net |
0
|
0
|
|
|
| Programming rights |
0
|
0
|
|
|
| Other current assets |
0
|
0
|
|
|
| Total current assets |
0
|
0
|
|
|
| Film and television costs |
0
|
0
|
|
|
| Investments |
0
|
0
|
|
|
| Investments in and amounts due from subsidiaries eliminated upon consolidation |
116,604
|
110,323
|
|
|
| Property and equipment, net |
0
|
0
|
|
|
| Franchise rights |
0
|
0
|
|
|
| Goodwill |
0
|
0
|
|
|
| Other intangible assets, net |
0
|
0
|
|
|
| Other noncurrent assets, net |
0
|
0
|
|
|
| Total assets |
116,604
|
110,323
|
|
|
| Liabilities and Equity |
|
|
|
|
| Accounts payable and accrued expenses related to trade creditors |
0
|
0
|
|
|
| Accrued participations and residuals |
0
|
0
|
|
|
| Accrued expenses and other current liabilities [condensed] |
384
|
233
|
|
|
| Current portion of long-term debt |
0
|
0
|
|
|
| Total current liabilities |
384
|
233
|
|
|
| Long-term debt, less current portion |
1,828
|
1,827
|
|
|
| Deferred income taxes |
0
|
0
|
|
|
| Other noncurrent liabilities |
0
|
0
|
|
|
| Redeemable noncontrolling interests and redeemable subsidiary preferred stock |
0
|
0
|
|
|
| Equity: |
|
|
|
|
| Common stock |
0
|
0
|
|
|
| Other shareholders' equity |
114,392
|
108,263
|
|
|
| Total Comcast Corporation shareholders' equity |
114,392
|
108,263
|
|
|
| Noncontrolling interests |
0
|
0
|
|
|
| Total equity |
114,392
|
108,263
|
|
|
| Total liabilities and equity |
116,604
|
110,323
|
|
|
| Combined CCHMO Parents [Member] |
|
|
|
|
| Assets |
|
|
|
|
| Cash and cash equivalents |
0
|
0
|
0
|
0
|
| Investments [Current] |
0
|
0
|
|
|
| Receivables, net |
0
|
0
|
|
|
| Programming rights |
0
|
0
|
|
|
| Other current assets |
0
|
0
|
|
|
| Total current assets |
0
|
0
|
|
|
| Film and television costs |
0
|
0
|
|
|
| Investments |
0
|
0
|
|
|
| Investments in and amounts due from subsidiaries eliminated upon consolidation |
63,108
|
58,677
|
|
|
| Property and equipment, net |
0
|
0
|
|
|
| Franchise rights |
0
|
0
|
|
|
| Goodwill |
0
|
0
|
|
|
| Other intangible assets, net |
0
|
0
|
|
|
| Other noncurrent assets, net |
0
|
0
|
|
|
| Total assets |
63,108
|
58,677
|
|
|
| Liabilities and Equity |
|
|
|
|
| Accounts payable and accrued expenses related to trade creditors |
0
|
1
|
|
|
| Accrued participations and residuals |
0
|
0
|
|
|
| Accrued expenses and other current liabilities [condensed] |
11
|
47
|
|
|
| Current portion of long-term debt |
0
|
677
|
|
|
| Total current liabilities |
11
|
725
|
|
|
| Long-term debt, less current portion |
822
|
822
|
|
|
| Deferred income taxes |
0
|
0
|
|
|
| Other noncurrent liabilities |
0
|
0
|
|
|
| Redeemable noncontrolling interests and redeemable subsidiary preferred stock |
0
|
0
|
|
|
| Equity: |
|
|
|
|
| Common stock |
0
|
0
|
|
|
| Other shareholders' equity |
62,275
|
57,130
|
|
|
| Total Comcast Corporation shareholders' equity |
62,275
|
57,130
|
|
|
| Noncontrolling interests |
0
|
0
|
|
|
| Total equity |
62,275
|
57,130
|
|
|
| Total liabilities and equity |
63,108
|
58,677
|
|
|
| NBCUniversal Media Parent [Member] |
|
|
|
|
| Assets |
|
|
|
|
| Cash and cash equivalents |
209
|
385
|
196
|
336
|
| Investments [Current] |
0
|
0
|
|
|
| Receivables, net |
0
|
0
|
|
|
| Programming rights |
0
|
0
|
|
|
| Other current assets |
39
|
41
|
|
|
| Total current assets |
248
|
426
|
|
|
| Film and television costs |
0
|
0
|
|
|
| Investments |
508
|
378
|
|
|
| Investments in and amounts due from subsidiaries eliminated upon consolidation |
42,103
|
41,239
|
|
|
| Property and equipment, net |
0
|
0
|
|
|
| Franchise rights |
0
|
0
|
|
|
| Goodwill |
0
|
0
|
|
|
| Other intangible assets, net |
0
|
0
|
|
|
| Other noncurrent assets, net |
87
|
92
|
|
|
| Total assets |
42,946
|
42,135
|
|
|
| Liabilities and Equity |
|
|
|
|
| Accounts payable and accrued expenses related to trade creditors |
0
|
0
|
|
|
| Accrued participations and residuals |
0
|
0
|
|
|
| Accrued expenses and other current liabilities [condensed] |
431
|
331
|
|
|
| Current portion of long-term debt |
1,007
|
1,006
|
|
|
| Total current liabilities |
1,438
|
1,337
|
|
|
| Long-term debt, less current portion |
8,223
|
9,218
|
|
|
| Deferred income taxes |
59
|
67
|
|
|
| Other noncurrent liabilities |
1,121
|
1,143
|
|
|
| Redeemable noncontrolling interests and redeemable subsidiary preferred stock |
0
|
0
|
|
|
| Equity: |
|
|
|
|
| Common stock |
0
|
0
|
|
|
| Other shareholders' equity |
32,105
|
30,370
|
|
|
| Total Comcast Corporation shareholders' equity |
32,105
|
30,370
|
|
|
| Noncontrolling interests |
0
|
0
|
|
|
| Total equity |
32,105
|
30,370
|
|
|
| Total liabilities and equity |
42,946
|
42,135
|
|
|
| Comcast Non-Guarantor Subsidiaries [Member] |
|
|
|
|
| Assets |
|
|
|
|
| Cash and cash equivalents |
1,684
|
3,525
|
4,351
|
1,382
|
| Investments [Current] |
137
|
602
|
|
|
| Receivables, net |
6,527
|
6,321
|
|
|
| Programming rights |
1,130
|
839
|
|
|
| Other current assets |
1,433
|
1,551
|
|
|
| Total current assets |
10,911
|
12,838
|
|
|
| Film and television costs |
5,712
|
5,727
|
|
|
| Investments |
2,785
|
2,721
|
|
|
| Investments in and amounts due from subsidiaries eliminated upon consolidation |
107,420
|
98,152
|
|
|
| Property and equipment, net |
31,966
|
30,754
|
|
|
| Franchise rights |
59,364
|
59,364
|
|
|
| Goodwill |
27,492
|
27,316
|
|
|
| Other intangible assets, net |
16,885
|
16,969
|
|
|
| Other noncurrent assets, net |
2,137
|
1,949
|
|
|
| Total assets |
264,672
|
255,790
|
|
|
| Liabilities and Equity |
|
|
|
|
| Accounts payable and accrued expenses related to trade creditors |
5,988
|
5,618
|
|
|
| Accrued participations and residuals |
1,491
|
1,347
|
|
|
| Accrued expenses and other current liabilities [condensed] |
3,925
|
3,767
|
|
|
| Current portion of long-term debt |
1,395
|
884
|
|
|
| Total current liabilities |
12,799
|
11,616
|
|
|
| Long-term debt, less current portion |
3,770
|
4,408
|
|
|
| Deferred income taxes |
33,405
|
33,127
|
|
|
| Other noncurrent liabilities |
7,314
|
7,484
|
|
|
| Redeemable noncontrolling interests and redeemable subsidiary preferred stock |
1,204
|
1,066
|
|
|
| Equity: |
|
|
|
|
| Common stock |
0
|
0
|
|
|
| Other shareholders' equity |
205,931
|
197,732
|
|
|
| Total Comcast Corporation shareholders' equity |
205,931
|
197,732
|
|
|
| Noncontrolling interests |
249
|
357
|
|
|
| Total equity |
206,180
|
198,089
|
|
|
| Total liabilities and equity |
264,672
|
255,790
|
|
|
| Elimination and Consolidation Adjustments [Member] |
|
|
|
|
| Assets |
|
|
|
|
| Cash and cash equivalents |
0
|
0
|
$ 0
|
$ 0
|
| Investments [Current] |
0
|
0
|
|
|
| Receivables, net |
0
|
0
|
|
|
| Programming rights |
0
|
0
|
|
|
| Other current assets |
0
|
0
|
|
|
| Total current assets |
0
|
0
|
|
|
| Film and television costs |
0
|
0
|
|
|
| Investments |
0
|
0
|
|
|
| Investments in and amounts due from subsidiaries eliminated upon consolidation |
(523,011)
|
(495,953)
|
|
|
| Property and equipment, net |
0
|
0
|
|
|
| Franchise rights |
0
|
0
|
|
|
| Goodwill |
0
|
0
|
|
|
| Other intangible assets, net |
0
|
0
|
|
|
| Other noncurrent assets, net |
(1,121)
|
(1,080)
|
|
|
| Total assets |
(524,132)
|
(497,033)
|
|
|
| Liabilities and Equity |
|
|
|
|
| Accounts payable and accrued expenses related to trade creditors |
0
|
0
|
|
|
| Accrued participations and residuals |
0
|
0
|
|
|
| Accrued expenses and other current liabilities [condensed] |
0
|
0
|
|
|
| Current portion of long-term debt |
0
|
0
|
|
|
| Total current liabilities |
0
|
0
|
|
|
| Long-term debt, less current portion |
0
|
0
|
|
|
| Deferred income taxes |
(975)
|
(936)
|
|
|
| Other noncurrent liabilities |
(146)
|
(144)
|
|
|
| Redeemable noncontrolling interests and redeemable subsidiary preferred stock |
0
|
0
|
|
|
| Equity: |
|
|
|
|
| Common stock |
0
|
0
|
|
|
| Other shareholders' equity |
(523,011)
|
(495,953)
|
|
|
| Total Comcast Corporation shareholders' equity |
(523,011)
|
(495,953)
|
|
|
| Noncontrolling interests |
0
|
0
|
|
|
| Total equity |
(523,011)
|
(495,953)
|
|
|
| Total liabilities and equity |
$ (524,132)
|
$ (497,033)
|
|
|