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Pension and Other Postretirement Plans - Reconciliation of the Change in Benefit Obligation and Plan Asset, Funded Status and Amounts Recognized in the Financial Statements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation | $ 5,496 | $ 5,387 |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 6,525 | 6,398 |
Service cost | 239 | 216 | $ 184
Interest cost | 184 | 209 | 226
Actuarial (gain) loss | (188) | 1,181 |
Special termination benefit | 0 | 54 |
Benefits paid | (263) | (1,445) |
Curtailment | (12) | (105) |
Other | (12) | 17 |
Projected benefit obligation at end of year | 6,473 | 6,525 | 6,398
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 4,069 | 4,964 |
Actual return on plan assets | 437 | 521 |
Employer contributions | 387 | 16 |
Benefits paid | (263) | (1,445) |
Other | (4) | 13 |
Fair value of plan assets at end of year | 4,626 | 4,069 | 4,964
Funded status—Net amount recognized | (1,847) | (2,456) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Noncurrent asset | 75 | 8 |
Current liability | (2) | (4) |
Noncurrent liability | (1,920) | (2,460) |
Total liability | (1,847) | (2,456) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net actuarial loss | (1,406) | (1,924) |
Prior service cost | (1) | (3) |
Total accumulated other comprehensive loss | (1,407) | (1,927) |
Other Postretirement Benefits |  |  |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at beginning of year | 1,082 | 842 |
Service cost | 10 | 10 | 10
Interest cost | 25 | 28 | 47
Actuarial (gain) loss | 114 | 107 |
Special termination benefit | 31 | 201 |
Benefits paid | (199) | (164) |
Projected benefit obligation at end of year | 1,129 | 1,082 | 842
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 51 | 52 |
Actual return on plan assets | 1 | 1 |
Employer contributions | 130 | 104 |
Plan participants' contributions | 66 | 58 |
Benefits paid | (199) | (164) |
Fair value of plan assets at end of year | 49 | 51 | $ 52
Funded status—Net amount recognized | (1,080) | (1,031) |
Amounts recognized in the consolidated balance sheets consist of: |  |  |
Current liability | (80) | (37) |
Noncurrent liability | (1,000) | (994) |
Total liability | (1,080) | (1,031) |
Amounts recognized in accumulated other comprehensive loss consist of: |  |  |
Net actuarial loss | 113 | 255 |
Prior service cost | 447 | 570 |
Total accumulated other comprehensive loss | 560 | 825 |
Plan participants' contributions | $ 66 | $ 58 |

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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, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -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 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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