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Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
Components of net periodic cost |  |  |  |  |  |
Discount rate | $ (433) | $ (228) | $ (397) | $ (493) |  |
Pension benefits |  |  |  |  |  |
Components of net periodic cost |  |  |  |  |  |
Discount rate | 2.74% |  | 2.74% |  | 3.37% | 3.31%

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- Definition Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Change in Weighted Average Discount Rate + 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=118255775&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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