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Employee Benefit Plans - Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Change in plan assets |  |  |  |
Value of plan assets at October 1 |  | $ 341 |  |
Value of plan assets at September 30 |  | 337 | $ 341 |
Amounts recognized in the balance sheet |  |  |  |
Noncurrent benefit assets |  | 33 | 35 |
Noncurrent benefit liabilities |  | (150) | (156) |
Pension Plans [Member] |  |  |  |
Change in benefit obligations |  |  |  |
Service cost | [1] | 6 | 9 | $ 8
Interest cost | [2] | 10 | 10 | 8
Other Postretirement Benefit Plans [Member] |  |  |  |
Change in benefit obligations |  |  |  |
Service cost | [1] | 1 | 1 | 1
Interest cost | [2] | 2 | 1 | 2
Continuing Operations [Member] | Pension Plans [Member] |  |  |  |
Change in benefit obligations |  |  |  |
Benefit obligations at October 1 |  | 404 | 428 |
Service cost |  | 5 | 8 |
Interest cost |  | 10 | 10 |
Participant contributions |  | 1 | 1 |
Benefits paid |  | (16) | (14) |
Actuarial (gain) loss |  | 65 | (14) |
Curtailments |  | (18) |  |
Foreign currency exchange rate changes |  | (18) | (6) |
Other |  | (1) | (1) |
Settlements |  | (27) | (8) |
Benefit obligations at September 30 |  | 405 | 404 | 428
Change in plan assets |  |  |  |
Value of plan assets at October 1 |  | 341 | 349 |
Actual return on plan assets |  | 50 | 10 |
Employer contributions |  | 5 | 9 |
Participant contributions |  | 1 | 1 |
Benefits paid |  | (16) | (14) |
Foreign currency exchange rate changes |  | (15) | (6) |
Settlements |  | (27) | (8) |
Other |  | (2) |  |
Value of plan assets at September 30 |  | 337 | 341 | 349
Unfunded status of the plans |  | (68) | (63) |
Amounts recognized in the balance sheet |  |  |  |
Noncurrent benefit assets |  | 33 | 35 |
Current benefit liabilities |  | (3) | (3) |
Noncurrent benefit liabilities |  | (98) | (95) |
Net amount recognized |  | $ (68) | $ (63) |
Weighted-average plan assumptions |  |  |  |
Discount rate |  | 1.96% | 2.97% |
Rate of compensation increase |  | 2.52% | 2.53% |
Continuing Operations [Member] | Other Postretirement Benefit Plans [Member] |  |  |  |
Change in benefit obligations |  |  |  |
Benefit obligations at October 1 |  | $ 58 | $ 62 |
Service cost |  | 1 | 1 |
Interest cost |  | 2 | 1 |
Benefits paid |  | (2) | (6) |
Actuarial (gain) loss |  | (7) |  |
Benefit obligations at September 30 |  | 52 | 58 | $ 62
Change in plan assets |  |  |  |
Unfunded status of the plans |  | (52) | (58) |
Amounts recognized in the balance sheet |  |  |  |
Current benefit liabilities |  | (3) | (4) |
Noncurrent benefit liabilities |  | (49) | (54) |
Net amount recognized |  | $ (52) | $ (58) |
Weighted-average plan assumptions |  |  |  |
Discount rate |  | 3.11% | 4.24% |
[1] | Service cost was not impacted by new accounting guidance adopted in 2018 and is therefore still classified within the selling, general and administrative expense and cost of sales captions on the Statements of Consolidated Comprehensive Income (Loss). See Note A for additional information.
[2] | These components are now classified within the other net periodic benefit income (costs) caption on the Statements of Consolidated Comprehensive Income (Loss) due to the adoption of new accounting guidance in 2018. See Note A for additional information.

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