Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| Statement of Comprehensive Income [Abstract] | ||
| Net income attributable to common shareholders | $ 113 | $ 106 |
| Other comprehensive (loss) income, net of tax: | ||
| Defined benefit pension plan actuarial loss (gain), net of tax of $0 and $(1) for the three months ended March 31, 2019 and 2018, respectively | 1 | (2) |
| Unrealized (loss) gain on cash flow hedges, net of tax of $(6) and $2 for the three months ended March 31, 2019 and 2018, respectively | (14) | 6 |
| Net other comprehensive (loss) income | (13) | 4 |
| Comprehensive income attributable to common shareholders | $ 100 | $ 110 |