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Pension and Postretirement Benefit Plans - Components of net periodic benefit cost and other information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Net periodic benefit cost (benefit) |  |
Net periodic benefit cost (benefit) | $ (19) | $ (32)
Funded | Postretirement Benefits |  |
Net periodic benefit cost (benefit) |  |
Service cost | 13 | 13
Interest cost | 20 | 19
Expected return on plan assets | (21) | (21)
Amortization of prior service benefit | (10) | (13)
Amortization of net actuarial loss | 15 | 14
Total non-operating expense (benefit) | 4 | (1)
Net periodic benefit cost (benefit) | 17 | 12
Funded | United States | Qualified and Non-qualified Pension Benefits |  |
Net periodic benefit cost (benefit) |  |
Service cost | 72 | 67
Interest cost | 141 | 142
Expected return on plan assets | (272) | (259)
Amortization of prior service benefit | (6) | (6)
Amortization of net actuarial loss | 126 | 97
Total non-operating expense (benefit) | (11) | (26)
Net periodic benefit cost (benefit) | 61 | 41
Funded | International | Qualified and Non-qualified Pension Benefits |  |
Net periodic benefit cost (benefit) |  |
Service cost | 36 | 33
Interest cost | 40 | 37
Expected return on plan assets | (78) | (69)
Amortization of prior service benefit | (3) | (3)
Amortization of net actuarial loss | 29 | 30
Total non-operating expense (benefit) | (12) | (5)
Net periodic benefit cost (benefit) | $ 24 | $ 28

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- Definition Amount of nonoperating expense (benefit) recognized in net periodic cost (benefit) of the defined benefit plan. + 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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- Definition Amount of cost recognized for passage of time related to 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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