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Pensions And Other Postretirement Benefits - Components of Expense and Assumptions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Weighted-average assumptions used to determine net expense(a) |  |  |
Administrative expenses and Pension Benefit Guarantee Corporation premiums | $ 214 | $ 121 |
Amounts to be amortized from accumulated other comprehensive loss into net periodic benefit cost, next fiscal year | 258 |  |
Other Postretirement Benefits Plan |  |  |
Components of expense |  |  |
Service cost | 17 | 20 | $ 19
Interest cost | 220 | 195 | 202
Expected return on plan assets | 0 | 0 | 0
Amortization of net actuarial (gains) losses | 30 | 54 | 23
Curtailments, settlements and other | (23) | (19) | (5)
Net periodic pension and OPEB (income) expense | $ 244 | $ 250 | $ 239
Weighted-average assumptions used to determine benefit obligations(a) |  |  |
Discount rate | 3.24% | 4.19% | 3.52%
Weighted-average assumptions used to determine net expense(a) |  |  |
Discount rate | 4.07% | 3.29% | 3.39%
U.S. | Pension Plan |  |  |
Components of expense |  |  |
Service cost | $ 393 | $ 330 | $ 315
Service cost | 179 | 209 |
Interest cost | 2,264 | 2,050 | 2,145
Expected return on plan assets | (3,483) | (3,890) | (3,677)
Amortization of net actuarial (gains) losses | 11 | 10 | (6)
Curtailments, settlements and other | 21 | (19) | (37)
Net periodic pension and OPEB (income) expense | $ (794) | $ (1,519) | $ (1,260)
Weighted-average assumptions used to determine benefit obligations(a) |  |  |
Discount rate | 3.20% | 4.22% | 3.53%
Weighted-average assumptions used to determine net expense(a) |  |  |
Discount rate | 3.92% | 3.19% | 3.35%
Expected rate of return on plan assets | 6.37% | 6.61% | 6.23%
U.S. | Pension Plan | Plan |  |  |
Weighted-average assumptions used to determine net expense(a) |  |  |
Expected rate of return on plan assets | 5.90% | 6.40% |
Non-U.S. | Pension Plan |  |  |
Components of expense |  |  |
Service cost | $ 132 | $ 163 | $ 199
Service cost | 120 | 149 |
Interest cost | 456 | 464 | 473
Expected return on plan assets | (786) | (825) | (750)
Amortization of net actuarial (gains) losses | 122 | 144 | 157
Curtailments, settlements and other | 142 | 43 | 8
Net periodic pension and OPEB (income) expense | $ 66 | $ (11) | $ 87
Weighted-average assumptions used to determine benefit obligations(a) |  |  |
Discount rate | 2.16% | 2.86% | 2.66%
Weighted-average assumptions used to determine net expense(a) |  |  |
Discount rate | 3.36% | 2.99% | 2.94%
Expected rate of return on plan assets | 5.76% | 6.09% | 5.82%

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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 50 -Paragraph 1 -Subparagraph (h)(4) -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)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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