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Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pension Plans [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Service cost | $ 40 | $ 35 | $ 121 | $ 105
Interest cost | 19 | 21 | 55 | 64
Expected return on plan assets | (48) | (44) | (144) | (134)
Amortization of: |  |  |  |
Net actuarial loss | 21 | 18 | 61 | 55
Prior service credit | (5) | (4) | (14) | (14)
Special charges | 3 | 2 | 7 | 3
Net periodic benefit cost | 30 | 28 | 86 | 79
Employee Benefit Plans (Textual) |  |  |  |
Future employer contributions to pension and other postretirement plans, as disclosed in annual report on Form 10-K | 128 |  | 128 |
Contributions to benefit plans |  |  | 121 | 28
Other Postretirement Benefit Plans [Member] |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Service cost | 1 | 1 | 4 | 4
Interest cost | 2 | 3 | 5 | 7
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of: |  |  |  |
Net actuarial loss | 0 | 0 | 0 | 0
Prior service credit | (2) | (2) | (5) | (5)
Special charges | 0 | 0 | 0 | 0
Net periodic benefit cost | 1 | $ 2 | 4 | 6
Employee Benefit Plans (Textual) |  |  |  |
Future employer contributions to pension and other postretirement plans, as disclosed in annual report on Form 10-K | $ 22 |  | 22 |
Contributions to benefit plans |  |  | $ 12 | $ 12

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit 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 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: 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 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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