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Employee Benefit Plans - Schedule of Pre-tax Change in Other Comprehensive Loss (Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
Pension Benefits |  |  |
Recognized in the Balance Sheet |  |  |
Losses (Gains) | $ 223 | $ (131) |
Expense (Income) Recognized in the Income Statement |  |  |
Amortization of Net Loss | 41 | 41 | $ 48
Settlement (Gain) Loss | (1) | 11 | (1)
Curtailment Loss | 0 | 4 |
Amortization of Prior Service Costs | 0 | 0 | 0
Amortization of net losses estimated to be expensed in next fiscal year | 43 |  |
Post-retirement Benefits |  |  |
Recognized in the Balance Sheet |  |  |
Losses (Gains) | (112) | (17) |
Expense (Income) Recognized in the Income Statement |  |  |
Amortization of Net Loss | 0 | 0 | 3
Settlement (Gain) Loss | 0 | 0 | 0
Curtailment Loss | 0 | 0 |
Amortization of Prior Service Costs | $ (2) | $ 0 | $ 0

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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