Goodwill and Intangible Assets (Details) (USD $) | 3 Months Ended | 12 Months Ended | 15 Months Ended |
In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2015 |
Goodwill [Roll Forward] | | | |
Balance at the beginning of the period, gross | $37,149.50 | | |
Balance at the beginning of the period, impairments | | -35,625.10 | -35,625.10 |
Balance at the beginning of the period | 1,524.40 | | |
Acquisitions, gross | 0.9 | | |
Dispositions, gross | 0 | | |
Translation and other adjustments, gross | -9.2 | | |
Acquisitions, impairments | 0 | | |
Dispositions, impairments | 0 | | |
Translation and other adjustments, impairments | 0 | | |
Acquisitions | 0.9 | | |
Dispositions | 0 | | |
Translation and other adjustments | -9.2 | | |
Balance at the end of the period, gross | 37,141.20 | 37,149.50 | 37,141.20 |
Balance at the end of the period, impairments | | -35,625.10 | -35,625.10 |
Balance at the end of the period | 1,516.10 | 1,524.40 | 1,516.10 |
Brand Group [Member] | | | |
Goodwill [Roll Forward] | | | |
Balance at the beginning of the period, gross | 281.6 | | |
Balance at the beginning of the period | 281.6 | | |
Acquisitions, gross | 0 | | |
Dispositions, gross | 0 | | |
Translation and other adjustments, gross | 0 | | |
Acquisitions | 0 | | |
Dispositions | 0 | | |
Translation and other adjustments | 0 | | |
Balance at the end of the period, gross | 281.6 | | 281.6 |
Balance at the end of the period | 281.6 | | 281.6 |
Membership Group [Member] | | | |
Goodwill [Roll Forward] | | | |
Balance at the beginning of the period, gross | 603.3 | | |
Balance at the beginning of the period | 603.3 | | |
Acquisitions, gross | 0 | | |
Dispositions, gross | 0 | | |
Translation and other adjustments, gross | -1.9 | | |
Acquisitions | 0 | | |
Dispositions | 0 | | |
Translation and other adjustments | -1.9 | | |
Balance at the end of the period, gross | 601.4 | | 601.4 |
Balance at the end of the period | 601.4 | | 601.4 |
AOL Platforms [Member] | | | |
Goodwill [Roll Forward] | | | |
Balance at the beginning of the period, gross | 639.5 | | |
Balance at the beginning of the period | 639.5 | | |
Acquisitions, gross | 0.9 | | |
Dispositions, gross | 0 | | |
Translation and other adjustments, gross | -7.3 | | |
Acquisitions | 0.9 | | |
Dispositions | 0 | | |
Translation and other adjustments | -7.3 | | |
Balance at the end of the period, gross | 633.1 | | 633.1 |
Balance at the end of the period | 633.1 | | 633.1 |
CorporateAndOther [Member] | | | |
Goodwill [Roll Forward] | | | |
Balance at the beginning of the period, gross | 35,625.10 | | |
Balance at the beginning of the period, impairments | | -35,625.10 | -35,625.10 |
Balance at the beginning of the period | 0 | | |
Acquisitions, gross | 0 | | |
Dispositions, gross | 0 | | |
Translation and other adjustments, gross | 0 | | |
Acquisitions, impairments | 0 | | |
Dispositions, impairments | 0 | | |
Translation and other adjustments, impairments | 0 | | |
Acquisitions | 0 | | |
Dispositions | 0 | | |
Translation and other adjustments | 0 | | |
Balance at the end of the period, gross | 35,625.10 | 35,625.10 | 35,625.10 |
Balance at the end of the period, impairments | | -35,625.10 | -35,625.10 |
Balance at the end of the period | $0 | $0 | $0 |