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Employee Benefit Plans (Details 4) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes Recognized in Comprehensive Income |  |  |
Prior service (credits) costs during period | $ 1 | $ (345) | $ (6)
Amortization of prior service (costs) credits | 20 | (19) | (30)
Other Benefits |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 32 | 60 | 72
Interest cost | 95 | 128 | 151
Expected return on plan assets | 0 | 0 | 0
Amortization of prior service costs (credits) | (28) | 14 | 14
Recognized actuarial losses | (5) | 19 | 34
Settlement losses | 0 | 0 | 0
Curtailment losses (gains) | 0 | 0 | 0
Total net periodic benefit cost | 94 | 221 | 271
Changes Recognized in Comprehensive Income |  |  |
Net actuarial (gain) loss during period | 284 | (430) | (362)
Amortization of actuarial loss | 5 | (19) | (34)
Prior service (credits) costs during period | 0 | (345) | 0
Amortization of prior service (costs) credits | 28 | (14) | (14)
Total changes recognized in other comprehensive income | 317 | (808) | (410)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income | 411 | (587) | (139)
U.S. | Pension Benefits |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 489 | 494 | 538
Interest cost | 366 | 377 | 502
Expected return on plan assets | (597) | (723) | (783)
Amortization of prior service costs (credits) | (5) | (9) | (8)
Recognized actuarial losses | 340 | 335 | 356
Settlement losses | 436 | 511 | 320
Curtailment losses (gains) | 0 | 0 | 0
Total net periodic benefit cost | 1,029 | 985 | 925
Changes Recognized in Comprehensive Income |  |  |
Net actuarial (gain) loss during period | 381 | 690 | 513
Amortization of actuarial loss | (776) | (846) | (676)
Prior service (credits) costs during period | 0 | 0 | 0
Amortization of prior service (costs) credits | 5 | 9 | 8
Total changes recognized in other comprehensive income | (390) | (147) | (155)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income | 639 | 838 | 770
Int’l. | Pension Benefits |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 151 | 159 | 185
Interest cost | 219 | 261 | 277
Expected return on plan assets | (239) | (243) | (262)
Amortization of prior service costs (credits) | 13 | 14 | 22
Recognized actuarial losses | 44 | 47 | 78
Settlement losses | 2 | 6 | 6
Curtailment losses (gains) | 0 | 0 | (14)
Total net periodic benefit cost | 190 | 244 | 292
Changes Recognized in Comprehensive Income |  |  |
Net actuarial (gain) loss during period | (94) | 55 | (260)
Amortization of actuarial loss | (46) | (53) | (84)
Prior service (credits) costs during period | 1 | 0 | (6)
Amortization of prior service (costs) credits | (13) | (14) | (24)
Total changes recognized in other comprehensive income | (152) | (12) | (374)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income | $ 38 | $ 232 | $ (82)

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- Definition Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of ten percent of greater of fair value of plan assets or benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e11661-114930 + Details
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