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Postretirement Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 679 | $ 691 |
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 50 | 43 |
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 185 | 188 |
Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 368 | 384 | $ 13
NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 76 | 76 |
Global stock funds/securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 128 | 118 |
Global stock funds/securities | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 43 | 38 |
Global stock funds/securities | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 71 | 66 |
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 | 14 | 14 |
Diversified growth and income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 28 | 26 |
Diversified growth and income funds | NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 28 | 26 |
Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 100 | 105 |
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 | 92 | 97 |
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 | 7 | 7 |
Government bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 44 | 47 |
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 | 17 | 19 |
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 | 27 | 28 |
Hedging instruments |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 5 | 6 |
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 | 5 | 6 |
Hedging instruments | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Hedge funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 1 |
Hedge funds | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Hedge funds | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Hedge funds | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0 | 0 |
Hedge funds | NAV Practical Expedient |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets |  | 1 |
Insurance contracts and other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 368 | 384 |
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 | 368 | 384 |
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 6 | 4 |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 6 | 4 |
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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