Reconciliation of changes in redeemable noncontrolling interests — | | | | | | | | | | | | Three Months Ended
March 31, | | | 2018 | | 2017 | Balance, beginning of period | | $ | 47 |
| | $ | — |
| Initial fair value of redeemable noncontrolling interests of acquired businesses | |
| | 45 |
| Comprehensive income (loss) adjustments: | |
| |
| Net income attributable to redeemable noncontrolling interests | | 1 |
| |
| Other comprehensive income (loss) attributable to redeemable noncontrolling interests | | 1 |
| | (1 | ) | Retained earnings adjustments: | |
| |
| Adjustment to redemption value | |
| |
| Balance, end of period | | $ | 49 |
| | $ | 44 |
|
|