Income Taxes - U.S. Federal Statutory Income Tax Rate Reconciled to Effective Tax Rate (Details) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Income Tax Disclosure [Abstract] |
|
|
|
| Pre-Tax Income |
$ 270
|
$ 241
|
$ 200
|
| Tax Expense/(Benefit) |
|
|
|
| U.S. federal statutory tax rate |
57
|
51
|
70
|
| State income taxes, net of federal benefit |
20
|
18
|
10
|
| Tax rate change |
0
|
0
|
(40)
|
| Nondeductible meals, entertainment and penalties |
1
|
1
|
1
|
| Stock based compensation |
(1)
|
(9)
|
(15)
|
| Uncertain tax positions |
0
|
1
|
4
|
| Tax credits |
(7)
|
(5)
|
(4)
|
| State and tax return to provision adjustments |
(8)
|
(7)
|
(5)
|
| Sec 199 benefits |
(1)
|
0
|
(3)
|
| Other |
(3)
|
(1)
|
4
|
| Total |
$ 58
|
$ 49
|
$ 22
|
| Percent of Pre-Tax Income (Loss) |
|
|
|
| U.S. federal statutory tax rate |
21.00%
|
21.00%
|
35.00%
|
| State income taxes, net of federal benefit |
7.00%
|
8.00%
|
5.00%
|
| Tax rate change |
0.00%
|
0.00%
|
(20.00%)
|
| Nondeductible meals, entertainment and penalties |
0.00%
|
0.00%
|
0.00%
|
| Stock based compensation |
0.00%
|
(4.00%)
|
(7.00%)
|
| Uncertain tax positions |
0.00%
|
0.00%
|
2.00%
|
| Tax credits |
(3.00%)
|
(2.00%)
|
(2.00%)
|
| State and tax return to provision adjustments |
(3.00%)
|
(3.00%)
|
(3.00%)
|
| Sec 199 benefits |
0.00%
|
0.00%
|
(1.00%)
|
| Other |
(1.00%)
|
0.00%
|
2.00%
|
| Total |
21.00%
|
20.00%
|
11.00%
|