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Employee Benefits - Schedule of Other information related to Company's other post-retirement plan's (Details) - Other Post-Retirement Benefits - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net periodic benefit cost recognized (millions) | $ 3 | $ 3 | $ 1
Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Weighted-average discount rate used to determine future benefit obligations | 2.93% | 3.91% | 3.32%
Weighted-average discount rate used to determine net periodic benefit costs | 3.91% | 3.32% | 3.71%
Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Weighted-average discount rate used to determine future benefit obligations | 3.25% | 4.26% | 3.64%
Weighted-average discount rate used to determine net periodic benefit costs | 4.26% | 3.64% | 4.15%

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