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Postretirement benefits Schedule of Net Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Plan [Member] | UNITED STATES |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of year | $ 3,035 | $ 10 |
Acquisition of Chubb Corp, Benefit obligation | 0 | 3,153 |
Service Cost | 63 | 75 | $ 0
Interest Cost | 105 | 103 | 0
Actuarial Loss | 232 | 131 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (132) | (79) |
Amendments | 0 | 0 |
Curtailments | 0 | (259) |
Settlements, Benefit obligations | (18) | (99) |
Foreign currency revaluation, benefit obligations | 0 | 0 |
Benefit Obligation, end of year | 3,285 | 3,035 | 10
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets at fair value, beginning of year | 2,765 | 9 |
Acquisition of Chubb Corp, Plan Assets | 0 | 2,473 |
Actual Return on Plan Assets | 441 | 359 |
Employer Contributions | 53 | 98 |
Benefits Paid | (132) | (79) |
Settlements, Plan Assets | (18) | (95) |
Foreign currency revaluation, Plan Assets | 0 | 0 |
Plan assets at fair value, end of year | 3,109 | 2,765 | 9
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (176) | (270) |
Pension Plan [Member] | Non-US [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of year | 1,025 | 559 |
Acquisition of Chubb Corp, Benefit obligation | 0 | 372 |
Service Cost | 17 | 18 | 6
Interest Cost | 27 | 30 | 21
Actuarial Loss | (4) | 204 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (28) | (22) |
Amendments | 0 | (9) |
Curtailments | (32) | (7) |
Settlements, Benefit obligations | (8) | (7) |
Foreign currency revaluation, benefit obligations | 80 | (113) |
Benefit Obligation, end of year | 1,077 | 1,025 | 559
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets at fair value, beginning of year | 962 | 564 |
Acquisition of Chubb Corp, Plan Assets | 0 | 315 |
Actual Return on Plan Assets | 100 | 168 |
Employer Contributions | 63 | 67 |
Benefits Paid | (28) | (22) |
Settlements, Plan Assets | (8) | (7) |
Foreign currency revaluation, Plan Assets | 83 | (123) |
Plan assets at fair value, end of year | 1,172 | 962 | 564
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 95 | (63) |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit Obligation, beginning of year | 165 | 16 |
Acquisition of Chubb Corp, Benefit obligation | 0 | 506 |
Service Cost | 2 | 10 | 1
Interest Cost | 4 | 17 | 0
Actuarial Loss | (2) | 36 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (14) | (11) |
Amendments | (23) | (410) |
Curtailments | 2 | 0 |
Settlements, Benefit obligations | 0 | 0 |
Foreign currency revaluation, benefit obligations | 3 | 1 |
Benefit Obligation, end of year | 137 | 165 | 16
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Plan assets at fair value, beginning of year | 159 | 0 |
Acquisition of Chubb Corp, Plan Assets | 0 | 138 |
Actual Return on Plan Assets | 6 | 29 |
Employer Contributions | 6 | 3 |
Benefits Paid | (14) | (11) |
Settlements, Plan Assets | 0 | 0 |
Foreign currency revaluation, Plan Assets | 0 | 0 |
Plan assets at fair value, end of year | 157 | 159 | $ 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan | $ 20 | $ (6) |

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 increase in plan assets of defined benefit plan from business combination. + 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)(6) -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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 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)(8) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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