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Employee Benefit Plans (Narrative) (Details) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2021 USD ($) retirees | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement |  |  |  | $ 48
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment |  |  |  | 51
Number of retirees | retirees | 6,000 |  |  |
Pension settlement |  | $ (83) | $ 0 | 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 |  | 6.5 |  |
Market value of employer's Common stock held under 401 (k) plan |  | $ 441 |  |
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] |  |  |  |
Asset allocation |  | 100.00% | 100.00% |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  | $ 715 | $ 18 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement |  | 715 | 17 |
Pension settlement |  | (83) | 0 | (96)
Accumulated other comprehensive income, unrecognized prior service cost (credit) |  | (94) |  |
Accumulated other comprehensive income, unrecognized actuarial losses |  | 314 |  |
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit obligation |  | 1,700 | 2,600 |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 1,700 | 2,600 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 1,600 | 2,500 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 1,200 | 1,900 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  | 1,600 | 2,500 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 1,200 | 1,900 |
Accumulated benefit obligation |  | 2,100 | 2,900 |
Contributions and expected future benefit payments |  | $ 28 |  |
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 | $ (3)
Accumulated other comprehensive income, unrecognized prior service cost (credit) |  | 1 |  |
Accumulated other comprehensive income, unrecognized actuarial losses |  | $ 46 |  |
Annual rate of increase in per capita cost of covered health care benefits assumed for transition period (as a percent) |  | 6.10% |  |
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 |  | $ 15 |  |
Other Postretirement Benefits Plan [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 6 years |  |
Other Postretirement Benefits Plan [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amortization period of actuarial gains and losses |  | 21 years |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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