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Pensions and Other Postretirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Non-service cost components of net periodic pension and OPEB income | $ 420 | $ 330 | $ 841 | $ 659
Global OPEB Plans [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Service cost | 5 | 6 | 10 | 10
Interest cost | 48 | 49 | 98 | 98
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service cost (credit) | (3) | (4) | (7) | (7)
Amortization of net actuarial (gains) losses | 13 | 8 | 26 | 16
Net periodic pension and OPEB (income) expense | 63 | 59 | 127 | 117
U.S. [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Service cost including administrative expenses | 82 | 79 | 165 | 158
Interest cost | 512 | 536 | 1,025 | 1,072
Expected return on plan assets | (972) | (919) | (1,945) | (1,838)
Amortization of prior service cost (credit) | (1) | (1) | (2) | (2)
Amortization of net actuarial (gains) losses | 3 | (2) | 5 | (3)
Net periodic pension and OPEB (income) expense | (376) | (307) | (752) | (613)
Non-U.S. [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Service cost | 39 | 40 | 105 | 86
Interest cost | 117 | 126 | 237 | 251
Expected return on plan assets | (208) | (172) | (420) | (343)
Amortization of prior service cost (credit) | 1 | 1 | 2 | 2
Amortization of net actuarial (gains) losses | 37 | 48 | 74 | 95
Net periodic pension and OPEB (income) expense | (14) | $ 43 | (2) | $ 91
Estimated contributions in 2018 | 1,200 |  | 1,200 |
Non-U.S. [Member] | Pension Plan [Member] | Korea [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Estimated contributions in 2018 | $ 300 |  | $ 300 |

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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/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 prior service cost (credit) 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)(5) -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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