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Postretirement benefits Schedule of Net Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Service Cost | $ 69 | $ 80 | $ 93
Pension Plan [Member] | UNITED STATES |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of year | 3,285 | 3,035 |
Service Cost | 57 | 63 | 75
Interest Cost | 105 | 105 | 103
Actuarial Loss (gain) | (214) | 232 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (108) | (132) |
Amendments | 0 | 0 |
Curtailments | 0 | 0 |
Settlements, Benefit obligations | (33) | (18) |
Foreign currency revaluation, benefit obligations | 0 | 0 |
Benefit Obligation, end of year | 3,092 | 3,285 | 3,035
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets at fair value, beginning of year | 3,109 | 2,765 |
Actual Return on Plan Assets | (218) | 441 |
Employer Contributions | 34 | 53 |
Benefits Paid | (108) | (132) |
Settlements | (33) | (18) |
Foreign currency revaluation, Plan Assets | 0 | 0 |
Plan assets at fair value, end of year | 2,784 | 3,109 | 2,765
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (308) | (176) |
Pension Plan [Member] | Non-US [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of year | 1,077 | 1,025 |
Service Cost | 12 | 17 | 18
Interest Cost | 27 | 27 | 30
Actuarial Loss (gain) | (71) | (4) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (26) | (28) |
Amendments | 4 | 0 |
Curtailments | 0 | (32) |
Settlements, Benefit obligations | (27) | (8) |
Foreign currency revaluation, benefit obligations | (54) | 80 |
Benefit Obligation, end of year | 942 | 1,077 | 1,025
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets at fair value, beginning of year | 1,172 | 962 |
Actual Return on Plan Assets | (63) | 100 |
Employer Contributions | 14 | 63 |
Benefits Paid | (26) | (28) |
Settlements | (27) | (8) |
Foreign currency revaluation, Plan Assets | (62) | 83 |
Plan assets at fair value, end of year | 1,008 | 1,172 | 962
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 66 | 95 |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of year | 137 | 165 |
Service Cost | 1 | 2 | 10
Interest Cost | 3 | 4 | 17
Actuarial Loss (gain) | (20) | (2) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (15) | (14) |
Amendments | 0 | (23) |
Curtailments | 0 | 2 |
Settlements, Benefit obligations | 0 | 0 |
Foreign currency revaluation, benefit obligations | 7 | 3 |
Benefit Obligation, end of year | 113 | 137 | 165
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets at fair value, beginning of year | 157 | 159 |
Actual Return on Plan Assets | 1 | 6 |
Employer Contributions | 0 | 6 |
Benefits Paid | (15) | (14) |
Settlements | 0 | 0 |
Foreign currency revaluation, Plan Assets | 0 | 0 |
Plan assets at fair value, end of year | 143 | 157 | $ 159
Defined Benefit Plan, Funded (Unfunded) Status of Plan | $ 30 | $ 20 |

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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 + Details
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