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Employee Benefits - Net Periodic Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax |  |  |
Total recognized | $ (41) | $ 37 | $ (25)
Retirement Plans |  |  |
Components of net periodic cost for retirement plans and post-retirement plans |  |  |
Service cost | 3 | 3 | 6
Interest cost | 74 | 78 | 96
Expected return on assets | (126) | (122) | (127)
Actuarial loss (gain) | 18 | 16 | 20
Prior service (credit) cost | 0 | 0 | 0
Other | 8 | 0 | 0
Net periodic benefit cost | (23) | (25) | (5)
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax |  |  |
Net actuarial (gain) loss | (20) | 60 | (6)
Recognized actuarial (gain) loss | (12) | (10) | (13)
Prior service (credit) cost | 0 | 0 | 0
Other | (7) |  |
Total recognized | (39) | 50 | (19)
Postretirement Plans |  |  |
Components of net periodic cost for retirement plans and post-retirement plans |  |  |
Service cost | 0 | 0 | 0
Interest cost | 2 | 2 | 3
Expected return on assets | 0 | 0 | 0
Actuarial loss (gain) | (2) | (1) | 0
Prior service (credit) cost | (2) | 0 | (1)
Other | 0 | 0 | 0
Net periodic benefit cost | (2) | 1 | 2
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax |  |  |
Net actuarial (gain) loss | (3) | (12) | (17)
Recognized actuarial (gain) loss | 1 | 1 | 0
Prior service (credit) cost | 1 | (8) | 1
Other |  |  |
Total recognized | $ (1) | $ (19) | $ (16)

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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