Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Statement of Comprehensive Income [Abstract] | ||
| Net income attributable to common stockholders | $ 106 | $ 93 |
| Pension amortized to periodic benefit cost: | ||
| Actuarial (gain) loss, net of tax of ($1) and $1 for the three months ended March 31, 2018 and 2017, respectively | (2) | 2 |
| Foreign currency translation adjustment | 0 | (1) |
| Unrealized gain on cash flow hedges, net of tax of $2 for the three months ended March 31, 2018 and 2017, respectively | 6 | 3 |
| Net other comprehensive income | 4 | 4 |
| Comprehensive income attributable to common stockholders | $ 110 | $ 97 |