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Employee Benefits Schedule of Fair Value, Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Pension Plan [Member] |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 800 | $ 753 | $ 695
Pension Plan [Member] | Money market funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 6 | 6 |
Pension Plan [Member] | Collective trust funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 764 | 692 |
Pension Plan [Member] | Private equity funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 5 | 6 |
Pension Plan [Member] | Defined Benefit Plan, Equity Securities, US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 25 | 49 |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 25 | 49 |
Pension Plan [Member] | Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 25 | 49 |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Pension Plan [Member] | Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Pension Plan [Member] | Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Equity Securities, US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Pension Plan [Member] | Other |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 775 | 704 |
Pension Plan [Member] | Other | Money market funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 6 | 6 |
Pension Plan [Member] | Other | Collective trust funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 764 | 692 |
Pension Plan [Member] | Other | Private equity funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 5 | 6 |
Other Postretirement Benefit Plans [Member] |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 37 | 35 | $ 34
Other Postretirement Benefit Plans [Member] | Money market funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 6 | 5 |
Other Postretirement Benefit Plans [Member] | Money Market Funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 3 | 4 |
Other Postretirement Benefit Plans [Member] | Collective trust funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 8 | 9 |
Other Postretirement Benefit Plans [Member] | Defined Benefit Plan, Equity Securities, US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 4 | 3 |
Other Postretirement Benefit Plans [Member] | Defined Benefit Plan, Equity Securities, Non-US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 10 | 9 |
Other Postretirement Benefit Plans [Member] | US Government Agencies Debt Securities |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 6 | 5 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 13 | 13 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 3 | 4 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Equity Securities, Non-US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 10 | 9 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 10 | 8 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 4 | 3 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Equity Securities, Non-US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 6 | 5 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Equity Securities, US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 3 [Member] | Defined Benefit Plan, Equity Securities, Non-US |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Postretirement Benefit Plans [Member] | Other |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 14 | 14 |
Other Postretirement Benefit Plans [Member] | Other | Money market funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 6 | 5 |
Other Postretirement Benefit Plans [Member] | Other | Collective trust funds |  |  |
Equity securities: |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 8 | $ 9 |

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