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Employee Benefits - Benefit Obligation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | $ 2,073 |  |
Fair value of plan assets at end of year | 2,219 | $ 2,073 |
Amounts recognized in consolidated balance sheets: |  |  |
Non-current liabilities | (244) | (274) |
Retirement Plans |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Net benefit obligation at beginning of year | 2,260 | 2,199 |
Service cost | 3 | 3 | $ 6
Interest cost | 74 | 78 | 96
Plan participants’ contributions | 0 | 0 |
Actuarial loss (gain) | 107 | 196 |
Gross benefits paid | (110) | (121) |
Foreign currency effect | 38 | (75) |
Other adjustments | (43) | (20) |
Net benefit obligation at end of year | 2,329 | 2,260 | 2,199
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 2,073 | 2,023 |
Actual return on plan assets | 263 | 259 |
Employer contributions | 8 | 8 |
Plan participants’ contributions | 0 | 0 |
Gross benefits paid | (110) | (121) |
Foreign currency effect | 31 | (74) |
Other adjustments | (46) | (22) |
Fair value of plan assets at end of year | 2,219 | 2,073 | 2,023
Funded status | (110) | (187) |
Amounts recognized in consolidated balance sheets: |  |  |
Non-current assets | 114 | 46 |
Current liabilities | (9) | (8) |
Non-current liabilities | (215) | (225) |
Total amounts recognized in consolidated balance sheets | (110) | (187) |
Accumulated benefit obligation | 2,319 | 2,251 |
Plans with accumulated benefit obligation in excess of the fair value of plan assets: |  |  |
Projected benefit obligation | 224 | 674 |
Accumulated benefit obligation | 214 | 665 |
Fair value of plan assets | 0 | 441 |
Amounts recognized in accumulated other comprehensive loss, net of tax: |  |  |
Net actuarial loss (gain) | 451 | 483 |
Prior service credit | 1 | 1 |
Total recognized | 452 | 484 |
Postretirement Plans |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Net benefit obligation at beginning of year | 57 | 80 |
Service cost | 0 | 0 | 0
Interest cost | 2 | 2 | 3
Plan participants’ contributions | 3 | 4 |
Actuarial loss (gain) | (5) | (6) |
Gross benefits paid | (8) | (10) |
Foreign currency effect | 0 | 0 |
Other adjustments | 0 | (13) |
Net benefit obligation at end of year | 49 | 57 | 80
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets at beginning of year | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Employer contributions | 25 | 6 |
Plan participants’ contributions | 3 | 4 |
Gross benefits paid | (8) | (10) |
Foreign currency effect |  | 0 |
Other adjustments |  | 0 |
Fair value of plan assets at end of year | 20 | 0 | $ 0
Funded status | (29) | (57) |
Amounts recognized in consolidated balance sheets: |  |  |
Non-current assets | 0 | 0 |
Current liabilities | 0 | (8) |
Non-current liabilities | (29) | (49) |
Total amounts recognized in consolidated balance sheets | (29) | (57) |
Amounts recognized in accumulated other comprehensive loss, net of tax: |  |  |
Net actuarial loss (gain) | (37) | (35) |
Prior service credit | (12) | (13) |
Total recognized | $ (49) | $ (48) |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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