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Condensed Consolidated Statement of Changes in Equity - USD ($) $ in Millions | Total | Redeemable Noncontrolling Interests and Redeemable Subsidiary Preferred Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock at Cost [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest [Member] | NBCUniversal Media LLC [Member] | NBCUniversal Media LLC [Member] Redeemable Noncontrolling Interest [Member] | NBCUniversal Media LLC [Member] Member's Capital [Member] | NBCUniversal Media LLC [Member] Accumulated Other Comprehensive Income (Loss) [Member] | NBCUniversal Media LLC [Member] Noncontrolling Interest [Member] | Class A Common Stock [Member] Common Stock [Member] | Class B Common Stock [Member] Common Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 | $ 56,163 |  | $ 38,230 | $ 23,065 | $ (7,517) | $ 98 | $ 2,231 |  |  |  |  |  | $ 56 | $ 0
Beginning balance at Dec. 31, 2016 |  |  |  |  |  |  |  | $ 40,875 |  | $ 38,894 | $ (135) | $ 2,116 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans | 288 |  | 288 |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock under repurchase program and employee plans | (2,476) |  | (379) | (2,097) |  |  |  |  |  |  |  |  |  |
Employee stock purchase plans | 94 |  | 94 |  |  |  |  |  |  |  |  |  |  |
Dividends declared | (1,498) |  |  | (1,498) |  |  |  | (1,141) |  | (1,141) |  |  |  |
Other comprehensive income (loss) | 218 |  |  |  |  | 136 | 82 | 132 |  |  | 50 | 82 |  |
Contributions from (distributions to) noncontrolling interests, net | (49) |  |  |  |  |  | (49) | (55) |  |  |  | (55) |  |
Contribution from member |  |  |  |  |  |  |  | 662 |  | 662 |  |  |  |
Purchase of Universal Studios Japan noncontrolling interests | (2,238) |  | (696) |  |  | 194 | (1,736) | (2,299) |  | (704) | 141 | (1,736) |  |
Other | 193 |  | (59) | (1) |  |  | 253 | 555 |  | 81 |  | 474 |  |
Net income | 5,156 |  |  | 5,094 |  |  | 62 | 2,548 |  | 2,481 |  | 67 |  |
Ending balance at Jun. 30, 2017 | 55,851 |  | 37,478 | 24,563 | (7,517) | 428 | 843 |  |  |  |  |  | 56 | 0
Ending balance at Jun. 30, 2017 |  |  |  |  |  |  |  | 41,277 |  | 40,273 | 56 | 948 |  |
Beginning balance at Dec. 31, 2016 |  | $ 1,446 |  |  |  |  |  |  | $ 530 |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from (distributions to) noncontrolling interests, net |  | (27) |  |  |  |  |  |  | (46) |  |  |  |  |
Other |  | (9) |  |  |  |  |  |  | 10 |  |  |  |  |
Net income |  | 41 |  |  |  |  |  |  | 18 |  |  |  |  |
Ending balance at Jun. 30, 2017 |  | 1,451 |  |  |  |  |  |  | 512 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effects of adoption of accounting standards | 33 |  |  | (43) |  | 76 |  | 0 |  | (232) | 232 |  |  |
Beginning balance at Dec. 31, 2017 | 69,459 |  | 37,497 | 38,202 | (7,517) | 379 | 843 |  |  |  |  |  | 55 | 0
Beginning balance at Dec. 31, 2017 |  |  |  |  |  |  |  | 43,041 |  | 42,148 | (20) | 913 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans | 290 |  | 290 |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock under repurchase program and employee plans | (2,996) |  | (529) | (2,466) |  |  |  |  |  |  |  |  | (1) |
Employee stock purchase plans | 112 |  | 112 |  |  |  |  |  |  |  |  |  |  |
Dividends declared | (1,760) |  |  | (1,760) |  |  |  | (990) |  | (990) |  |  |  |
Other comprehensive income (loss) | (19) |  |  |  |  | 6 | (25) | (19) |  |  | 6 | (25) |  |
Contributions from (distributions to) noncontrolling interests, net | 317 |  |  |  |  |  | 317 | 313 |  |  |  | 313 |  |
Other | (36) |  | 57 | 2 |  |  | (95) | (11) |  | 91 |  | (102) |  |
Net income | 6,343 |  |  | 6,334 |  |  | 9 | 2,751 |  | 2,760 |  | (9) |  |
Ending balance at Jun. 30, 2018 | 71,743 |  | $ 37,427 | $ 40,269 | $ (7,517) | $ 461 | $ 1,049 |  |  |  |  |  | $ 54 | $ 0
Ending balance at Jun. 30, 2018 |  |  |  |  |  |  |  | 45,085 |  | $ 43,777 | $ 218 | $ 1,090 |  |
Beginning balance at Dec. 31, 2017 | 1,357 | 1,357 |  |  |  |  |  | 409 | 409 |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from (distributions to) noncontrolling interests, net |  | (31) |  |  |  |  |  |  | (33) |  |  |  |  |
Other |  | (24) |  |  |  |  |  |  | (5) |  |  |  |  |
Net income |  | 41 |  |  |  |  |  |  | 20 |  |  |  |  |
Ending balance at Jun. 30, 2018 | $ 1,343 | $ 1,343 |  |  |  |  |  | $ 391 | $ 391 |  |  |  |  |

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