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Postretirement Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 246 | $ 679 |
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 40 | 50 |
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 135 | 185 |
Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 20 | 368 | $ 384
NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 51 | 76 |
Global stock funds/securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 97 | 128 |
Global stock funds/securities | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 37 | 43 |
Global stock funds/securities | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 51 | 71 |
Global stock funds/securities | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Global stock funds/securities | NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 9 | 14 |
Diversified growth and income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 19 | 28 |
Diversified growth and income funds | NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 19 | 28 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 73 | 100 |
Corporate bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 1 | 1 |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 67 | 92 |
Corporate bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Corporate bonds | NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 5 | 7 |
Government bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 31 | 44 |
Government bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Government bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 13 | 17 |
Government bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Government bonds | NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 18 | 27 |
Hedging instruments |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 4 | 5 |
Hedging instruments | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Hedging instruments | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 4 | 5 |
Hedging instruments | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Insurance contracts and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 20 | 368 |
Insurance contracts and other | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Insurance contracts and other | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Insurance contracts and other | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 20 | 368 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 2 | 6 |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 2 | 6 |
Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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