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Change in Benefit Obligation (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Pension Benefits | U.S. Plans |  |  |  |
Change in Benefit Obligation |  |  |  |
Benefit obligation—beginning of fiscal year |  | $ 1,072 | $ 1,005 |
Visa Europe acquisition |  | 0 | 0 |
Service cost |  | 0 | 13 | $ 47
Interest cost |  | 36 | 40 | 40
Actuarial loss (gain) |  | 58 | 86 |
Benefit payments |  | 137 | 64 |
Plan amendment |  | 0 | (8) |
Foreign currency exchange rate changes |  | 0 | 0 |
Benefit obligation—end of fiscal year |  | 913 | 1,072 | 1,005
Accumulated benefit obligation |  | 913 | 1,072 |
Change in Plan Assets: |  |  |  |
Fair value of plan assets—beginning of fiscal year |  | 1,077 | 1,022 |
Visa Europe acquisition |  | 0 | 0 |
Actual return on plan assets |  | 125 | 118 |
Company contribution |  | 9 | 1 |
Benefit payments |  | 137 | 64 |
Foreign currency exchange rate changes |  | 0 | 0 |
Fair value of plan assets—end of fiscal year |  | 1,074 | 1,077 | 1,022
Funded status at end of fiscal year |  | 161 | 5 |
Recognized in Consolidated Balance Sheets: |  |  |  |
Non-current asset |  | (168) | (22) |
Current liability |  | (1) | (9) |
Non-current liability |  | (6) | (8) |
Funded status at end of fiscal year |  | 161 | 5 |
Pension Benefits | Non-U.S. Plans |  |  |  |
Change in Benefit Obligation |  |  |  |
Benefit obligation—beginning of fiscal year |  | 474 | 0 |
Visa Europe acquisition |  | 0 | 381 |
Service cost | [1] | 6 | 1 |
Interest cost | [1] | 11 | 3 |
Actuarial loss (gain) |  | 52 | (86) |
Benefit payments |  | 14 | 1 |
Plan amendment |  | 0 | 0 |
Foreign currency exchange rate changes |  | 8 | 4 |
Benefit obligation—end of fiscal year |  | 433 | 474 | 0
Accumulated benefit obligation |  | 433 | 474 |
Change in Plan Assets: |  |  |  |
Fair value of plan assets—beginning of fiscal year |  | 415 | 0 |
Visa Europe acquisition |  | 0 | 287 |
Actual return on plan assets |  | 17 | 25 |
Company contribution |  | 5 | 102 |
Benefit payments |  | 14 | 1 |
Foreign currency exchange rate changes |  | 10 | 2 |
Fair value of plan assets—end of fiscal year |  | 433 | 415 | 0
Funded status at end of fiscal year |  | 0 | (59) |
Recognized in Consolidated Balance Sheets: |  |  |  |
Non-current asset |  | 0 | 0 |
Current liability |  | (5) | (6) |
Non-current liability |  | 5 | (53) |
Funded status at end of fiscal year |  | 0 | (59) |
Other Postretirement Benefits | U.S. Plans |  |  |  |
Change in Benefit Obligation |  |  |  |
Benefit obligation—beginning of fiscal year |  | 14 | 18 |
Visa Europe acquisition |  | 0 | 0 |
Service cost |  | 0 | 0 | 0
Interest cost |  | 1 | 1 | 1
Actuarial loss (gain) |  | 1 | 2 |
Benefit payments |  | 3 | 3 |
Plan amendment |  | 0 | 0 |
Foreign currency exchange rate changes |  | 0 | 0 |
Benefit obligation—end of fiscal year |  | 11 | 14 | 18
Change in Plan Assets: |  |  |  |
Fair value of plan assets—beginning of fiscal year |  | 0 | 0 |
Visa Europe acquisition |  | 0 | 0 |
Actual return on plan assets |  | 0 | 0 |
Company contribution |  | 3 | 3 |
Benefit payments |  | 3 | 3 |
Foreign currency exchange rate changes |  | 0 | 0 |
Fair value of plan assets—end of fiscal year |  | 0 | 0 | $ 0
Funded status at end of fiscal year |  | (11) | (14) |
Recognized in Consolidated Balance Sheets: |  |  |  |
Non-current asset |  | 0 | 0 |
Current liability |  | (2) | (3) |
Non-current liability |  | (9) | (11) |
Funded status at end of fiscal year |  | $ (11) | $ (14) |
[1] | For fiscal 2016, it represents Visa Europe's UK pension plans' net pension benefit cost recognized from the Closing through September 30, 2016.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- 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 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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