Redeemable Noncontrolling Interests - Reconciliation of Changes in Redeemable Noncontrolling Interests (Details) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Feb. 01, 2017 |
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Increase (Decrease) in Temporary Equity [Roll Forward] | |||
| Balance, beginning of period | $ 47,000,000 | $ 0 | |
| Initial fair value of redeemable noncontrolling interests of acquired businesses | $ 44,000,000 | 45,000,000 | |
| Net income attributable to redeemable noncontrolling interests | 1,000,000 | ||
| Other comprehensive income (loss) attributable to redeemable noncontrolling interests | 1,000,000 | (1,000,000) | |
| Adjustment to redemption value | |||
| Balance, end of period | $ 49,000,000 | $ 44,000,000 | |