Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Statement Of Income And Comprehensive Income [Abstract] | ||||
| Net income attributable to common stockholders | $ 148 | $ 174 | $ 367 | $ 377 |
| Pension amortized to periodic benefit cost: | ||||
| Actuarial loss, net of tax of $1 for the three months and $3 for the nine months | 1 | 1 | 4 | 4 |
| Foreign currency translation adjustment | (1) | |||
| Unrealized loss on cash flow hedges, net of tax of $(3) and $0 for the three months and $(10) and $0 for the nine months | (4) | (15) | ||
| Net other comprehensive income (loss) | (3) | 1 | (11) | 3 |
| Comprehensive income attributable to common stockholders | $ 145 | $ 175 | $ 356 | $ 380 |