Redeemable Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended
Feb. 01, 2017	Mar. 31, 2018	Mar. 31, 2017
Temporary Equity Disclosure [Abstract]
Initial fair value of redeemable noncontrolling interests of acquired businesses	$ 44		$ 45
Ownership percentage by noncontrolling owners	20.00%

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant