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% | ||