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Pension and Other Benefit Programs - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contributions | $ 0 | $ 0 | $ 136,000,000 |
Amount pending settlement | $ 52,000,000 | 25,000,000 |  |
Period of amortization | 4 years |  |  |
Corridor approach percentage | 10.00% |  |  |
Cash surrender value of life insurance | $ 58,000,000 | 57,000,000 |  |
Net periodic post-retirement benefit costs | $ 0 | $ 1,000,000 | (15,000,000) |
Discount rate | 3.00% | 4.00% |  |
Weighted-average discount rate for determining interest costs (pension/SERP plans) | 3.70% | 3.00% |  |
Health care cost trend rate assumed | 6.70% |  |  |
Ultimate health care cost trend rate | 4.50% |  |  |
Contribution plan cost | $ 42,000,000 | $ 39,000,000 | 38,000,000 |
Supplemental Employee Retirement Plan |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net periodic post-retirement benefit costs | 1,000,000 | 1,000,000 | 1,000,000 |
Post-retirement Benefit Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net periodic post-retirement benefit costs | 2,000,000 | $ 5,000,000 | $ 5,000,000 |
Anticipated medicare subsidy receipts | $ 11,000,000 |  |  |
Equity securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  |  | 5.00% | 65.00%
Fixed income securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocation, percentage |  |  | 95.00% | 35.00%

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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