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Employee Benefits - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 1,102 | $ 1,046 | $ 1,163
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Government bonds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2 | 2 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan [Member] | Common - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 8 | 6 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan [Member] | Common - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 0 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan [Member] | Preferred - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 3 | 3 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan [Member] | Corporate bonds - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 155 | 157 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan [Member] | Corporate bonds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 72 | 65 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan [Member] | U.S. Treasury, Agencies, and Corporations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 190 | 180 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan [Member] | State and municpal bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 27 | 28 |
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan [Member] | Equity - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2 | 1 |
Level 1 [Member] | Government bonds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 1 [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 13 | 10 |
Level 1 [Member] | Pension Plan [Member] | Common - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 8 | 6 |
Level 1 [Member] | Pension Plan [Member] | Common - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 0 |
Level 1 [Member] | Pension Plan [Member] | Preferred - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 3 | 3 |
Level 1 [Member] | Pension Plan [Member] | Corporate bonds - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 1 [Member] | Pension Plan [Member] | Corporate bonds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 1 [Member] | Pension Plan [Member] | U.S. Treasury, Agencies, and Corporations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 1 [Member] | Pension Plan [Member] | State and municpal bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 1 [Member] | Pension Plan [Member] | Equity - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2 | 1 |
Level 2 [Member] | Government bonds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2 | 2 |
Level 2 [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 446 | 432 |
Level 2 [Member] | Pension Plan [Member] | Common - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 2 [Member] | Pension Plan [Member] | Common - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 0 |
Level 2 [Member] | Pension Plan [Member] | Preferred - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 2 [Member] | Pension Plan [Member] | Corporate bonds - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 155 | 157 |
Level 2 [Member] | Pension Plan [Member] | Corporate bonds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 72 | 65 |
Level 2 [Member] | Pension Plan [Member] | U.S. Treasury, Agencies, and Corporations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 190 | 180 |
Level 2 [Member] | Pension Plan [Member] | State and municpal bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 27 | 28 |
Level 2 [Member] | Pension Plan [Member] | Equity - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Government bonds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Pension Plan [Member] | Common - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Pension Plan [Member] | Common - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets |  | 0 |
Level 3 [Member] | Pension Plan [Member] | Preferred - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Pension Plan [Member] | Corporate bonds - US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Pension Plan [Member] | Corporate bonds - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Pension Plan [Member] | U.S. Treasury, Agencies, and Corporations [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Pension Plan [Member] | State and municpal bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Level 3 [Member] | Pension Plan [Member] | Equity - International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 0 | 0 |
Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan [Member] | Collective Investment Funds (measured at NAV) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 584 | 546 |
Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan [Member] | Insurance investment contracts and pooled separate accounts (measured at NAV) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 16 | 16 |
Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan [Member] | Other assets (measured at NAV) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 43 | $ 42 |

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