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Pension and Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Pension and Postretirement Benefit Plans |
Components of net periodic benefit cost (benefit) |
| Three months ended September 30, |
| Qualified and Non-qualified |  |  |  |  |  |  |
| Pension Benefits |  | Postretirement |
| United States | International |  | Benefits |
(Millions) | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Net periodic benefit cost (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 72 |  | $ | 67 |  | $ | 37 |  | $ | 33 |  | $ | 13 |  | $ | 13 |
Non-operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost | $ | 141 |  | $ | 141 |  | $ | 40 |  | $ | 38 |  | $ | 20 |  | $ | 20 |
Expected return on plan assets |  | (272) |  |  | (259) |  |  | (78) |  |  | (71) |  |  | (21) |  |  | (21) |
Amortization of prior service benefit |  | (6) |  |  | (5) |  |  | (4) |  |  | (3) |  |  | (10) |  |  | (13) |
Amortization of net actuarial loss |  | 126 |  |  | 97 |  |  | 29 |  |  | 29 |  |  | 15 |  |  | 14 |
Total non-operating expense (benefit) |  | (11) |  |  | (26) |  |  | (13) |  |  | (7) |  |  | 4 |  |  | — |
Total net periodic benefit cost (benefit) | $ | 61 |  | $ | 41 |  | $ | 24 |  | $ | 26 |  | $ | 17 |  | $ | 13 |
| Nine months ended September 30, |
| Qualified and Non-qualified |  |  |  |  |  |  |
| Pension Benefits |  | Postretirement |
| United States | International |  | Benefits |
(Millions) | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Net periodic benefit cost (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 216 |  | $ | 201 |  | $ | 110 |  | $ | 100 |  | $ | 39 |  | $ | 38 |
Non-operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost | $ | 423 |  | $ | 425 |  | $ | 120 |  | $ | 112 |  | $ | 60 |  | $ | 59 |
Expected return on plan assets |  | (816) |  |  | (777) |  |  | (235) |  |  | (209) |  |  | (63) |  |  | (63) |
Amortization of prior service benefit |  | (18) |  |  | (17) |  |  | (10) |  |  | (9) |  |  | (30) |  |  | (39) |
Amortization of net actuarial loss |  | 378 |  |  | 291 |  |  | 87 |  |  | 89 |  |  | 45 |  |  | 42 |
Total non-operating expense (benefit) |  | (33) |  |  | (78) |  |  | (38) |  |  | (17) |  |  | 12 |  |  | (1) |
Total net periodic benefit cost (benefit) | $ | 183 |  | $ | 123 |  | $ | 72 |  | $ | 83 |  | $ | 51 |  | $ | 37 |

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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=108410482&loc=d3e1928-114920 + Details
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