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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.S. |  |  |
Change in Plan Assets |  |  |
Employer contributions | $ 728 |  |
Pension Benefits | U.S. |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 13,271 | $ 13,563 |
Service cost | 489 | 494 | $ 538
Interest cost | 366 | 377 | 502
Plan participants' contributions | 0 | 0 |
Plan amendments | 0 | 0 |
Actuarial (gain) loss | 1,168 | 903 |
Foreign currency exchange rate changes | 0 | 0 |
Benefits paid | (1,714) | (2,066) |
Divestitures | 0 | 0 |
Benefit obligation at December 31 | 13,580 | 13,271 | 13,563
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 9,550 | 10,274 |
Actual return on plan assets | 1,384 | 936 |
Foreign currency exchange rate changes | 0 | 0 |
Employer contributions | 728 | 406 |
Plan participants' contributions | 0 | 0 |
Benefits paid | (1,714) | (2,066) |
Divestitures | 0 | 0 |
Fair value of plan assets at December 31 | 9,948 | 9,550 | 10,274
Funded status at December 31 | (3,632) | (3,721) |
Pension Benefits | Int’l. |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 5,169 | 5,336 |
Service cost | 151 | 159 | 185
Interest cost | 219 | 261 | 277
Plan participants' contributions | 4 | 5 |
Plan amendments | 1 | 0 |
Actuarial (gain) loss | (37) | 426 |
Foreign currency exchange rate changes | 374 | (524) |
Benefits paid | (310) | (494) |
Divestitures | (31) | 0 |
Benefit obligation at December 31 | 5,540 | 5,169 | 5,336
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 4,174 | 4,109 |
Actual return on plan assets | 319 | 642 |
Foreign currency exchange rate changes | 358 | (552) |
Employer contributions | 252 | 464 |
Plan participants' contributions | 4 | 5 |
Benefits paid | (310) | (494) |
Divestitures | (31) | 0 |
Fair value of plan assets at December 31 | 4,766 | 4,174 | 4,109
Funded status at December 31 | (774) | (995) |
Other Benefits |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 2,549 | 3,324 |
Service cost | 32 | 60 | 72
Interest cost | 95 | 128 | 151
Plan participants' contributions | 78 | 148 |
Plan amendments | 0 | (345) |
Actuarial (gain) loss | 266 | (437) |
Foreign currency exchange rate changes | 10 | 8 |
Benefits paid | (229) | (337) |
Divestitures | (13) | 0 |
Benefit obligation at December 31 | 2,788 | 2,549 | 3,324
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Employer contributions | 151 | 189 |
Plan participants' contributions | 78 | 148 |
Benefits paid | (229) | (337) |
Divestitures | 0 | 0 |
Fair value of plan assets at December 31 | 0 | 0 | $ 0
Funded status at December 31 | $ (2,788) | $ (2,549) |

X
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 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)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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