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Pension and Postretirement Plans (Narrative) (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
United States |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company contributions to plans |  |  | $ 13 |  |
Additional contributions expected to be made during remainder of fiscal year | $ 24 |  | 24 |  |
Pension Benefits | United States |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension settlement expense | $ (39) | $ (2) | (39) | $ (6) |
Increase (decrease) in obligation pension benefits |  |  | $ 300 |  |
Discount rate | 2.70% |  | 2.70% |  | 3.30%
Pension Benefits | United States | Qualified Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension settlement expense |  |  | $ 34 |  |
Pension Benefits | United States | Nonqualified Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension settlement expense |  |  | 5 |  |
Pension Benefits | Int’l. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company contributions to plans |  |  | 13 |  |
Additional contributions expected to be made during remainder of fiscal year | $ 13 |  | 13 |  |
Pension settlement expense | $ 0 | $ 0 | $ 0 | $ 0 |

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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=118255775&loc=d3e1928-114920 + Details
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