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Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Pension Plans [Member] |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |
Service cost | $ 35 | $ 30 | $ 70 | $ 60 |
Interest cost | 22 | 25 | 43 | 49 |
Expected return on plan assets | (46) | (41) | (90) | (83) |
Amortization of: |  |  |  |  |
Net actuarial (gain) loss | 19 | 10 | 37 | 20 |
Prior service credit | (5) | (5) | (10) | (9) |
Special charges | 1 | 2 | 1 | 2 |
Net periodic benefit cost | 26 | 21 | 51 | 39 |
Employee Benefit Plans (Textual) |  |  |  |  |
Contributions to benefit plans |  |  | 19 | 23 |
Future employer contributions to pension and other postretirement plans, as disclosed in annual report on Form 10-K |  |  |  |  | $ 140
Previously planned discretionary contributions subject to reconsideration | 100 |  | 100 |  |
Other Postretirement Benefit Plans [Member] |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |
Service cost | 2 | 1 | 3 | 2 |
Interest cost | 2 | 3 | 4 | 6 |
Expected return on plan assets | 0 | 0 | 0 | 0 |
Amortization of: |  |  |  |  |
Net actuarial (gain) loss | 0 | (1) | 0 | (2) |
Prior service credit | (2) | (2) | (3) | (4) |
Special charges | 0 | 0 | 0 | 1 |
Net periodic benefit cost | $ 2 | $ 1 | 4 | 3 |
Employee Benefit Plans (Textual) |  |  |  |  |
Contributions to benefit plans |  |  | $ 7 | $ 8 |
Future employer contributions to pension and other postretirement plans, as disclosed in annual report on Form 10-K |  |  |  |  | $ 21

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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=118257860&loc=d3e4179-114921 Reference 2: 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=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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=109237824&loc=SL108413299-114919 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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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=118257860&loc=d3e4179-114921 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)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&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=118257860&loc=d3e4587-114921 + Details
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