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Pension and Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans |
Components of net periodic benefit cost (benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30,
​ | ​ | Qualified and Non-qualified | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Postretirement
​ | ​ | United States | International | ​ | Benefits
(Millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Net periodic benefit cost (benefit) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 63 | ​ | $ | 72 | ​ | $ | 33 | ​ | $ | 37 | ​ | $ | 11 | ​ | $ | 13
Non-operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest cost | ​ | $ | 156 | ​ | $ | 141 | ​ | $ | 39 | ​ | $ | 40 | ​ | $ | 21 | ​ | $ | 20
Expected return on plan assets | ​ |  | (260) | ​ |  | (272) | ​ |  | (75) | ​ |  | (79) | ​ |  | (21) | ​ |  | (21)
Amortization of prior service benefit | ​ |  | (6) | ​ |  | (6) | ​ |  | (3) | ​ |  | (3) | ​ |  | (7) | ​ |  | (10)
Amortization of net actuarial loss | ​ | ​ | 92 | ​ | ​ | 126 | ​ | ​ | 19 | ​ | ​ | 29 | ​ | ​ | 8 | ​ | ​ | 15
Settlements, curtailments, special termination benefits and other | ​ |  | 35 | ​ |  | — | ​ |  | 1 | ​ |  | — | ​ |  | — | ​ |  | —
Total non-operating expense (benefit) | ​ | ​ | 17 | ​ | ​ | (11) | ​ | ​ | (19) | ​ | ​ | (13) | ​ | ​ | 1 | ​ | ​ | 4
Total net periodic benefit cost (benefit) | ​ | $ | 80 | ​ | $ | 61 | ​ | $ | 14 | ​ | $ | 24 | ​ | $ | 12 | ​ | $ | 17
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ | ​ | Qualified and Non-qualified | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Postretirement
​ | ​ | United States | International | ​ | Benefits
(Millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Net periodic benefit cost (benefit) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 125 | ​ | $ | 144 | ​ | $ | 66 | ​ | $ | 73 | ​ | $ | 22 | ​ | $ | 26
Non-operating expense | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Interest cost | ​ | $ | 311 | ​ | $ | 282 | ​ | $ | 78 | ​ | $ | 80 | ​ | $ | 42 | ​ | $ | 40
Expected return on plan assets | ​ |  | (520) | ​ |  | (544) | ​ |  | (150) | ​ |  | (157) | ​ |  | (41) | ​ |  | (42)
Amortization of prior service benefit | ​ |  | (12) | ​ |  | (12) | ​ |  | (6) | ​ |  | (6) | ​ |  | (14) | ​ |  | (20)
Amortization of net actuarial loss | ​ | ​ | 183 | ​ | ​ | 252 | ​ | ​ | 39 | ​ | ​ | 58 | ​ | ​ | 17 | ​ | ​ | 30
Settlements, curtailments, special termination benefits and other | ​ |  | 35 | ​ |  | — | ​ |  | 1 | ​ |  | — | ​ |  | — | ​ |  | —
Total non-operating expense (benefit) | ​ | ​ | (3) | ​ | ​ | (22) | ​ | ​ | (38) | ​ | ​ | (25) | ​ | ​ | 4 | ​ | ​ | 8
Total net periodic benefit cost (benefit) | ​ | $ | 122 | ​ | $ | 122 | ​ | $ | 28 | ​ | $ | 48 | ​ | $ | 26 | ​ | $ | 34
​

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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