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Redeemable Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 01, 2017 | Dec. 31, 2017
Temporary Equity Disclosure [Abstract] |  |
Initial fair value of redeemable noncontrolling interests of acquired businesses | $ 44 | $ 44
Ownership percentage by noncontrolling owners | 20.00% |
Adjustment to redemption value |  | $ 6

X
- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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X
- Definition Value of accretion of temporary equity to its redemption value during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- References No definition available. + Details
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X
- Definition Value of new stock classified as temporary equity issued during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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