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Pensions and Other Postretirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Non-service cost components of net periodic pension and OPEB income | $ 230 | $ 421
Global OPEB Plans [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Service cost | 4 | 5
Interest cost | 54 | 50
Expected return on plan assets | 0 | 0
Amortization of prior service cost (credit) | (3) | (4)
Amortization of net actuarial losses | 8 | 13
Net periodic pension and OPEB (income) expense | 63 | 64
U.S. [Member] | Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Service cost including administrative expenses | 98 | 83
Interest cost | 566 | 513
Expected return on plan assets | (868) | (973)
Amortization of prior service cost (credit) | (1) | (1)
Amortization of net actuarial losses | 3 | 2
Net periodic pension and OPEB (income) expense | (202) | (376)
Non-U.S. [Member] | Pension Plan [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Service cost | 35 | 66
Interest cost | 120 | 120
Expected return on plan assets | (195) | (212)
Amortization of prior service cost (credit) | 1 | 1
Amortization of net actuarial losses | 29 | 37
Net periodic pension and OPEB (income) expense | $ (10) | $ 12

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- Definition The actuarial present value of benefits attributed to the pension benefit formula to services rendered by employees during the period and administrative expenses + References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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