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Recent Accounting Pronouncements and Tax Reform (Tables) | 6 Months Ended
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Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Revenue From Contract With Customer Financial Statement Impact | The tables below present the effects on our condensed consolidated statement of income and balance sheet for the prior year periods presented. Condensed Consolidated Statement of Income
| Three Months Ended June 30, 2017 |  | Six Months Ended June 30, 2017
(in millions) | Previously Reported |  | Effects of Adoption |  | As Adjusted |  |  | Previously Reported |  | Effects of Adoption |  | As Adjusted |
Revenue | $ | 21,165 |  | $ | 121 |  | $ | 21,286 |  |  | $ | 41,628 |  | $ | 245 |  | $ | 41,873 |
Total costs and expenses | $ | 16,607 |  | $ | 111 |  | $ | 16,718 |  |  | $ | 32,540 |  | $ | 223 |  | $ | 32,763 |
Operating income | $ | 4,558 |  | $ | 10 |  | $ | 4,568 |  |  | $ | 9,088 |  | $ | 22 |  | $ | 9,110 |
Net income attributable to Comcast Corporation | $ | 2,513 |  | $ | 8 |  | $ | 2,521 |  |  | $ | 5,079 |  | $ | 15 |  | $ | 5,094 |
Condensed Consolidated Balance Sheet
| December 31, 2017
(in millions) | Previously Reported |  | Effects of Adoption |  | As Adjusted |
Total current assets | $ | 16,060 |  | $ | 283 |  | $ | 16,343 |
Film and television costs | $ | 7,076 |  | $ | 11 |  | $ | 7,087 |
Other intangible assets, net | $ | 18,779 |  | $ | (646 | ) | $ | 18,133 |
Other noncurrent assets, net | $ | 3,489 |  | $ | 865 |  | $ | 4,354 |
Total assets | $ | 186,949 |  | $ | 513 |  | $ | 187,462 |
Total current liabilities | $ | 21,561 |  | $ | 432 |  | $ | 21,993 |
Deferred income taxes | $ | 24,256 |  | $ | 3 |  | $ | 24,259 |
Other noncurrent liabilities | $ | 10,904 |  | $ | 68 |  | $ | 10,972 |
Total equity | $ | 69,449 |  | $ | 10 |  | $ | 69,459 |
Total liabilities and equity | $ | 186,949 |  | $ | 513 |  | $ | 187,462 |
The table below presents the effects these changes had on our Cable Communications segment revenue, operating costs and expenses, and depreciation and amortization expense as a result of the updated guidance for the prior year period. Previously reported amounts are based on amounts previously presented in the segment information footnote.
| Three Months Ended June 30, 2017 |  | Six Months Ended June 30, 2017
(in millions) | Previously Reported |  | Effects of Adoption |  | As Adjusted |  |  | Previously Reported |  | Effects of Adoption |  | As Adjusted |
Residential: |  |  |  |  |  |  |
Video | $ | 5,797 |  | $ | (57 | ) | $ | 5,740 |  |  | $ | 11,571 |  | $ | (125 | ) | $ | 11,446 |
High-speed Internet | 3,679 |  | 219 |  | 3,898 |  |  | 7,285 |  | 455 |  | 7,740 |
Voice | 856 |  | 178 |  | 1,034 |  |  | 1,719 |  | 349 |  | 2,068 |
Business services | 1,531 |  | 54 |  | 1,585 |  |  | 3,021 |  | 107 |  | 3,128 |
Advertising | 574 |  | 52 |  | 626 |  |  | 1,086 |  | 94 |  | 1,180 |
Other | 685 |  | (311 | ) | 374 |  |  | 1,352 |  | (607 | ) | 745 |
Total Cable Communications revenue | $ | 13,122 |  | $ | 135 |  | $ | 13,257 |  |  | $ | 26,034 |  | $ | 273 |  | $ | 26,307 |
Operating costs and expenses | $ | 7,802 |  | $ | 162 |  | $ | 7,964 |  |  | $ | 15,516 |  | $ | 324 |  | $ | 15,840 |
Depreciation and amortization expense | $ | 2,001 |  | $ | (34 | ) | $ | 1,967 |  |  | $ | 3,981 |  | $ | (68 | ) | $ | 3,913 |
NBCUniversal Media LLC [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Revenue From Contract With Customer Financial Statement Impact | The tables below present the effects on our condensed consolidated statement of income and balance sheet for the prior year periods presented. Condensed Consolidated Statement of Income
| Three Months Ended June 30, 2017 |  | Six Months Ended June 30, 2017
(in millions) | Previously Reported |  | Effects of Adoption |  | As Adjusted |  |  | Previously Reported |  | Effects of Adoption |  | As Adjusted |
Revenue | $ | 8,331 |  | $ | (13 | ) | $ | 8,318 |  |  | $ | 16,199 |  | $ | (28 | ) | $ | 16,171 |
Total costs and expenses | $ | 6,780 |  | $ | (16 | ) | $ | 6,764 |  |  | $ | 13,139 |  | $ | (33 | ) | $ | 13,106 |
Operating income | $ | 1,551 |  | $ | 3 |  | $ | 1,554 |  |  | $ | 3,060 |  | $ | 5 |  | $ | 3,065 |
Net income attributable to NBCUniversal | $ | 1,276 |  | $ | 3 |  | $ | 1,279 |  |  | $ | 2,476 |  | $ | 5 |  | $ | 2,481 |
Condensed Consolidated Balance Sheet
| December 31, 2017
(in millions) | Previously Reported |  | Effects of Adoption |  | As Adjusted |
Total current assets | $ | 11,673 |  | $ | 284 |  | $ | 11,957 |
Film and television costs | $ | 7,071 |  | $ | 11 |  | $ | 7,082 |
Other noncurrent assets, net | $ | 1,872 |  | $ | (68 | ) | $ | 1,804 |
Total assets | $ | 71,073 |  | $ | 227 |  | $ | 71,300 |
Total current liabilities | $ | 9,602 |  | $ | 330 |  | $ | 9,932 |
Other noncurrent liabilities | $ | 4,109 |  | $ | 44 |  | $ | 4,153 |
Total equity | $ | 43,188 |  | $ | (147 | ) | $ | 43,041 |
Total liabilities and equity | $ | 71,073 |  | $ | 227 |  | $ | 71,300 |

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