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Redeemable Noncontrolling Interests - Reconciliation of Changes in Redeemable Noncontrolling Interests (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 01, 2017
Sep. 30, 2017
Sep. 30, 2017
Increase (Decrease) in Temporary Equity [Roll Forward]      
Balance, beginning of period   $ 46,000,000 $ 0
Initial fair value of redeemable noncontrolling interests of acquired business $ 45,000,000 45,000,000
Purchase accounting adjustments   (1,000,000) (1,000,000)
Net income (loss) attributable to redeemable noncontrolling interests   1,000,000 (2,000,000)
Other comprehensive income (loss) attributable to redeemable noncontrolling interests   2,000,000
Adjustment to redemption value   1,000,000 3,000,000
Balance, end of period   $ 47,000,000 $ 47,000,000