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Other Postretirement Benefits - Schedule of Fair Values of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 397 | $ 326 |  |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funds for retiree health benefits | 208 | 204 |  |
Investments (including funds for retiree health benefits) | 966 | 829 |  |
Funds for retiree health benefits measured at NAV per share | 42 | 33 |  |
Pending activities | 18 | 23 |  |
Total fair value of plan net assets | 1,026 | 885 | $ 1,039 | $ 975
Other Postretirement Benefits | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 404 | 322 |  |
Other Postretirement Benefits | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 331 | 289 |  |
Other Postretirement Benefits | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 23 | 14 |  |
Other Postretirement Benefits | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 758 | 625 |  |
Other Postretirement Benefits | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funds for retiree health benefits | 110 | 118 |  |
Investments (including funds for retiree health benefits) | 110 | 118 |  |
Other Postretirement Benefits | Level 1 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funds for retiree health benefits | 98 | 86 |  |
Investments (including funds for retiree health benefits) | 856 | 711 |  |
Other Postretirement Benefits | Level 2 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 404 | 322 |  |
Other Postretirement Benefits | Level 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 331 | 289 |  |
Other Postretirement Benefits | Level 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 23 | 14 |  |
Other Postretirement Benefits | Level 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 758 | $ 625 |  |

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