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EMPLOYEE RETIREMENT PLANS - Defined-benefit Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Qualified |  |
Information for the defined-benefit pension plans with an accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | $ 945 | $ 1,044
Accumulated benefit obligation | 945 | 1,044
Fair value of plan assets | 679 | 704
Non-Qualified |  |
Information for the defined-benefit pension plans with an accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 170 | 170
Accumulated benefit obligation | 170 | 170
Fair value of plan assets | $ 0 | $ 0

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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 + Details
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