Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Statement of Comprehensive Income [Abstract] |
|
|
|
| Net income attributable to common shareholders |
$ 621
|
$ 567
|
$ 426
|
| Other comprehensive income (loss), net of tax: |
|
|
|
| Change in employee benefit plan funded status, net of tax of $3, $20 and $2 in 2019, 2018 and 2017, respectively |
8
|
60
|
7
|
| Defined benefit pension plans: |
|
|
|
| Amortization of actuarial loss, net of tax of $1, $3 and $5 in 2019, 2018 and 2017, respectively |
4
|
7
|
7
|
| Pension reclassification from accumulated other comprehensive loss of tax effects resulting from the Tax Cuts and Jobs Act |
0
|
(22)
|
0
|
| Foreign currency translation adjustment |
(1)
|
0
|
(1)
|
| Unrealized loss on cash flow hedges, net of tax of $(5), $0 and $(4) in 2019, 2018 and 2017, respectively |
(13)
|
(2)
|
(6)
|
| Cash flow hedges reclassification from accumulated other comprehensive loss of tax effects resulting from the Tax Cuts and Jobs Act |
0
|
2
|
0
|
| Net other comprehensive (loss) income |
(2)
|
45
|
7
|
| Comprehensive income attributable to common shareholders |
$ 619
|
$ 612
|
$ 433
|