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Pension and Other Postretirement Plans - Pension and Other Postretirement Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Level 3 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 409 | $ 350 | $ 383
Pension Benefits |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,964 | 3,827 | 3,932
Pension Benefits | Level 1 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 513 | 478 |
Pension Benefits | Level 2 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 825 | 751 |
Pension Benefits | Level 3 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 357 | 297 |
Pension Benefits | Assets Measured at NAV |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,269 | 2,301 |
Pension Benefits | Equity securities funds |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,957 | 1,457 |
Pension Benefits | Equity securities funds | Level 1 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 47 | 254 |
Pension Benefits | Equity securities funds | Level 2 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 117 | 106 |
Pension Benefits | Equity securities funds | Level 3 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 71 | 63 |
Pension Benefits | Equity securities funds | Assets Measured at NAV |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,722 | 1,034 |
Pension Benefits | Fixed-income securities |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,732 | 1,520 |
Pension Benefits | Fixed-income securities | Level 1 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Fixed-income securities | Level 2 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 687 | 628 |
Pension Benefits | Fixed-income securities | Level 3 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 69 | 87 |
Pension Benefits | Fixed-income securities | Assets Measured at NAV |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 976 | 805 |
Pension Benefits | Alternatives |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 776 | 596 |
Pension Benefits | Alternatives | Level 1 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Alternatives | Level 2 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Alternatives | Level 3 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 205 | 134 |
Pension Benefits | Alternatives | Assets Measured at NAV |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 571 | 462 |
Pension Benefits | Other |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 499 | 254 |
Pension Benefits | Other | Level 1 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 466 | 224 |
Pension Benefits | Other | Level 2 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 21 | 17 |
Pension Benefits | Other | Level 3 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12 | 13 |
Pension Benefits | Other | Assets Measured at NAV |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 52 | 53 | $ 54
Other Postretirement Benefits | Deposit administration fund |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 52 | 53 |
Other Postretirement Benefits | Deposit administration fund | Level 1 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Deposit administration fund | Level 2 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other Postretirement Benefits | Deposit administration fund | Level 3 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 52 | 53 |
Other Postretirement Benefits | Deposit administration fund | Assets Measured at NAV |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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