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Pension and Postretirement Benefit Plans - US Pension Weighted Averages and Expected Returns Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Postretirement Benefits |  |  |
Asset Allocation assumption |  |  |
Company contributions | $ 3 | $ 3 |
Funded | Qualified and Non-Pension Benefits |  |  |
Asset Allocation assumption |  |  |
Company contributions | 177 | $ 153 |
Funded | Qualified and Non-Pension Benefits | Minimum |  |  |
Asset Allocation assumption |  |  |
Estimated pension contributions for next fiscal year | 100 |  |
Funded | Qualified and Non-Pension Benefits | Maximum |  |  |
Asset Allocation assumption |  |  |
Estimated pension contributions for next fiscal year | $ 200 |  |
Funded | Postretirement Benefits |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Discount rate | 2.88% | 2.50% | 3.27%
Percentage increase (decrease) in discount rate obligation from the prior year | 0.38% |  |
Weighted-average assumptions used to determine net cost for years ended |  |  |
Discount rate - service cost | 3.21% | 3.45% | 4.53%
Discount rate - interest cost | 2.20% | 3.00% | 4.15%
Expected return on assets | 6.15% | 6.32% | 6.43%
Asset Allocation assumption |  |  |
Company contributions | $ 3 | $ 3 |
Funded | United States |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Original percentage medical inflation indexation by company in year | 3.00% |  |
Revised percentage medical inflation indexation by company in year | 1.50% |  |
Funded | United States | Qualified and Non-Pension Benefits |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Discount rate | 2.89% | 2.55% | 3.25%
Compensation rate increase | 3.21% | 3.21% | 3.21%
Percentage increase (decrease) in discount rate obligation from the prior year | 0.34% |  |
Weighted-average assumptions used to determine net cost for years ended |  |  |
Discount rate - service cost | 2.81% | 3.41% | 4.44%
Discount rate - interest cost | 1.92% | 2.87% | 4.02%
Expected return on assets | 6.50% | 6.75% | 7.00%
Compensation rate increase | 3.21% | 3.21% | 4.10%
Asset Allocation assumption |  |  |
Company contributions | $ 77 | $ 61 |
Funded | United States | Qualified and Non-Pension Benefits | Qualified |  |  |
Company's assumption for the expected return on plan assets |  |  |
Expected return on assets for next fiscal year (as a percent) | 6.00% |  |
Asset Allocation assumption |  |  |
Rate of return on plan assets (as a percent) | 6.70% | 13.60% | 16.30%
Number years used in the calculation of one average annual actual return on plan assets (in years) | 10 years |  |
Number years used in the calculation of a second average annual actual return on plan assets (in years) | 25 years |  |
Average annual actual return on plan assets over the past 10 years (as a percent) | 8.60% |  |
Average annual actual return on plan assets over the past 25 years (as a percent) | 8.70% |  |
Funded | United States | Qualified and Non-Pension Benefits | Qualified | Global equity |  |  |
Asset Allocation assumption |  |  |
Asset allocation assumption for next fiscal year (as a percent) | 22.00% |  |
Funded | United States | Qualified and Non-Pension Benefits | Qualified | Private equity |  |  |
Asset Allocation assumption |  |  |
Asset allocation assumption for next fiscal year (as a percent) | 12.00% |  |
Funded | United States | Qualified and Non-Pension Benefits | Qualified | Fixed income |  |  |
Asset Allocation assumption |  |  |
Asset allocation assumption for next fiscal year (as a percent) | 50.00% |  |
Funded | United States | Qualified and Non-Pension Benefits | Qualified | Total Absolute Return |  |  |
Asset Allocation assumption |  |  |
Asset allocation assumption for next fiscal year (as a percent) | 16.00% |  |
Funded | United States | Qualified and Non-Pension Benefits | Primary U.S. Qualified Pension Plan | Qualified |  |  |
Company's assumption for the expected return on plan assets |  |  |
Expected return on assets (as a percent) | 6.50% |  |
Funded | United States | Pension and Postretirement Benefit plans |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Impact to the Projected Benefit Obligation (PBO) as a result of a change in discount rate | $ 900 |  |
Funded | International | Qualified and Non-Pension Benefits |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Discount rate | 1.80% | 1.38% | 1.81%
Compensation rate increase | 2.86% | 2.88% | 2.88%
Weighted-average assumptions used to determine net cost for years ended |  |  |
Discount rate - service cost | 1.23% | 1.61% | 2.39%
Discount rate - interest cost | 1.13% | 1.61% | 2.26%
Expected return on assets | 4.36% | 4.70% | 4.90%
Compensation rate increase | 2.88% | 2.88% | 2.89%
Asset Allocation assumption |  |  |
Company contributions | $ 100 | $ 92 |

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- Definition This element represents the interest rate used to adjust for time value of money for interest costs. + References No definition available. + Details
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- Definition The number years of used in the calculation of one average annual actual return on plan assets. + References No definition available. + Details
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- Definition The average annual actual return on plan assets over the past ten years, percentage. + References No definition available. + Details
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- Definition This element represents the percentage change in assumed discount rate from the prior year used in calculating the benefit obligation. + References No definition available. + Details
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- Definition The original percentage that the Company would credit the Retiree Medical Saving Account and the Medicare Health Reimbursement Arrangement as an inflation indexation. + References No definition available. + Details
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- Definition The revised percentage that the Company would credit the Retiree Medical Savings Account and the Medicare Health Reimbursement arrangement as an inflation indexation. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -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 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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