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Benefit Plans (Narrative) (Details) - USD ($) |  | 6 Months Ended
--- | --- | ---
May 31, 2021 | Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Decrease in accrued postretirement health care cost liability | $ 432,000,000 |
Pension [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, contributions by employer |  | $ 6,000,000
Pension [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Anticipated additional employer contributions |  | 25,000,000
Postretirement [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, plan assets, contributions by employer |  | 0
Postretirement [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Anticipated additional employer contributions |  | $ 60,000,000

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