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Pension Benefits - Schedule of Fair Value 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 |  |
Private Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets |  | 440 |  |
Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets |  | 1,310 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funds for retiree health benefits | (208) | (204) |  |
Funds for retiree health benefits measured at NAV per share | (42) | (33) |  |
Total funds for retiree health benefits | (250) | (237) |  |
Investments (excluding funds for retiree health benefits) | 15,597 | 14,105 |  |
Pending activities | 11 | (655) |  |
Total fair value of plan net assets | 15,608 | 13,450 | $ 14,274 | $ 12,472
Pension Benefits | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,652 | 3,525 |  |
Pension Benefits | International Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,354 | 2,896 |  |
Pension Benefits | U.S. Government Issued Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,496 | 1,886 |  |
Pension Benefits | Corporate Bonds Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,260 | 2,619 |  |
Pension Benefits | Structured Assets Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 173 | 6 |  |
Pension Benefits | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 955 | 121 |  |
Pension Benefits | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 326 | 716 |  |
Pension Benefits | Futures |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets |  | 568 |  |
Pension Benefits | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 13,216 | 12,337 |  |
Pension Benefits | Private Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 555 |  |  |
Pension Benefits | Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,806 |  |  |
Pension Benefits | Hedge Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 270 | 255 |  |
Pension Benefits | Investments Valued Using NAV Per Share |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 2,631 | 2,005 |  |
Pension Benefits | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funds for retiree health benefits | (110) | (118) |  |
Investments (excluding funds for retiree health benefits) | 6,896 | 7,021 |  |
Pension Benefits | Level 1 | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,652 | 3,515 |  |
Pension Benefits | Level 1 | International Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,354 | 2,896 |  |
Pension Benefits | Level 1 | U.S. Government Issued Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Corporate Bonds Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Structured Assets Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets |  | 160 |  |
Pension Benefits | Level 1 | Futures |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets |  | 568 |  |
Pension Benefits | Level 1 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7,006 | 7,139 |  |
Pension Benefits | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Funds for retiree health benefits | (98) | (86) |  |
Investments (excluding funds for retiree health benefits) | 6,112 | 5,112 |  |
Pension Benefits | Level 2 | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 10 |  |
Pension Benefits | Level 2 | U.S. Government Issued Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,496 | 1,886 |  |
Pension Benefits | Level 2 | Corporate Bonds Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,260 | 2,619 |  |
Pension Benefits | Level 2 | Structured Assets Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 173 | 6 |  |
Pension Benefits | Level 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 955 | 121 |  |
Pension Benefits | Level 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 326 | 556 |  |
Pension Benefits | Level 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 6,210 | $ 5,198 |  |

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