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Employee Retirement Plans (Postretirement Benefits) (Details) - Postretirement Benefits [Member] - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Change in benefit obligation |  |  |  |  |
Benefit obligation at beginning of year | $ 789 | $ 776 |  |  |
Service cost | 10 | 10 | $ 9 |  |
Interest cost | 24 | 26 | 26 |  |
Plan participants’ contributions | 8 | 8 |  |  |
Plan amendments | (40) |  |  |  |
Actuarial loss (gain) | (48) | 17 |  |  |
Benefits paid | (46) | (50) |  |  |
Medicare subsidy received | 2 | 2 |  |  |
Benefit obligation at end of year | 699 | 789 | 776 |  |
Funded status at end of year |  |  |  |  |
Benefit obligations | $ (789) | $ (776) | $ (776) | $ (699) | $ (789)
Funded status of plans |  |  |  | (699) | (789)
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |
Current liability |  |  |  | (37) | (40)
Noncurrent liability |  |  |  | (662) | (749)
Recognized liability |  |  |  | (699) | (789)
Amounts recognized in accumulated other comprehensive income consist of: |  |  |  |  |
Net actuarial loss |  |  |  | 21 | 68
Prior service credit |  |  |  | (44) | (12)
Amount recognized at end of year |  |  |  | $ (23) | $ 56

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References No definition available. + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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