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Employee Benefit Plans (Narrative) (Details) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2021 USD ($) retirees | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of retirees | retirees | 6,000 |  |  |
Pension settlement |  | $ 0 | $ (83) | $ 0
Percentage of non-matching employer's contribution to eligible participants (as a percent) |  | 1.00% |  |
Employer's Common stock held under 401 (k) plan (in shares) | shares |  | 5.9 |  |
Market value of employer's Common stock held under 401 (k) plan |  | $ 550 |  |
Cash dividend received on employer's Common stock held under 401 (k) plan |  | 10 |  |
Increase (Decrease) in Obligation, Pension Benefits | $ 700 |  |  |
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  | 1 | 715 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement |  | 1 | 715 |
Pension settlement |  | 0 | (83) | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  | 2 | 0 | 0
Accumulated other comprehensive income, unrecognized prior service cost (credit) |  | (75) |  |
Accumulated other comprehensive income, unrecognized actuarial losses |  | 226 |  |
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit obligation |  | 1,300 | 1,700 |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 1,200 | 1,700 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 1,300 | 1,600 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 900 | 1,200 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 1,200 | 1,600 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 800 | 1,200 |
Accumulated benefit obligation |  | 1,600 | 2,100 |
Contributions and expected future benefit payments |  | $ 25 |  |
Pension Benefits [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 2 years |  |
Pension Benefits [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 28 years |  |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement |  | $ 0 | 0 |
Pension settlement |  | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  | 0 | $ 0 | $ 0
Accumulated other comprehensive income, unrecognized prior service cost (credit) |  | 1 |  |
Accumulated other comprehensive income, unrecognized actuarial losses |  | $ 16 |  |
Annual rate of increase in per capita cost of covered health care benefits assumed for transition period (as a percent) |  | 6.90% |  |
Annual rate for per capita cost of covered health care benefits assumed for 2025 and thereafter (as a percent) |  | 4.50% |  |
Year ultimate rate assumed for per capita cost of health care benefits is to be reached |  | 2031 |  |
Contributions and expected future benefit payments |  | $ 14 |  |
Other Postretirement Benefits Plan [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 5 years |  |
Other Postretirement Benefits Plan [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 19 years |  |

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