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Debt - Financing Activity and Covenants - Additional Information (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 EUR (€) | Aug. 31, 2012 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Aug. 30, 2019 USD ($) | Mar. 31, 2018 USD ($) | May 17, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  |  |  | $ 2,000,000 | $ 15,000,000 |  |  |
Repayment of debt, accelerated amortization |  |  |  |  |  |  | 13,000,000 |  |  |
Cash repatriation |  |  |  |  | $ 900,000,000 | 590,000,000 |  |  |  |
Carrying value of debt |  |  | $ 1,513,000,000 |  | 1,513,000,000 | 2,307,000,000 |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  | $ 800,000,000 |  | $ 800,000,000 |  |  |  |  |
Covenant restrictions [Abstract] |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio |  |  | 4.5 |  | 4.5 |  |  |  |  |
Consolidated net leverage ratio |  |  | 2.6 |  | 2.6 |  |  |  |  |
Minimum required consolidated interest coverage ratio |  |  | 3.0 |  | 3.0 |  |  |  |  |
Consolidated interest coverage ratio |  |  | 6.1 |  | 6.1 |  |  |  |  |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | Dec. 31, 2029 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 6.50% |  | 6.50% |  |  |  |  |
Debt instrument, maturity year |  |  |  |  | 2029 |  |  |  |  |
Carrying value of debt |  |  | $ 54,000,000 |  | $ 54,000,000 | 52,000,000 |  |  |  |
Gain (loss) on repurchase of debt instrument |  |  |  |  |  |  | 5,000,000 |  |  |
Par value of debt repurchases |  |  |  | $ 182,000,000 |  |  |  |  |  |
Aggregate purchase price of debt |  |  |  | $ 177,000,000 |  |  |  |  |  |
Reduction in carrying value of debt |  |  |  |  |  |  | 90,000,000 |  |  |
Repayment of debt, accelerated accretion |  |  |  |  |  |  | 92,000,000 |  |  |
2018 Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, outstanding amount |  |  | 94,000,000 |  | 94,000,000 | 109,000,000 |  |  |  |
Outstanding amount of receivables sold to affiliate |  |  | $ 133,000,000 |  | $ 133,000,000 | $ 153,000,000 |  |  |  |
Debt, weighted average interest rate |  |  | 1.20% |  | 1.20% | 1.80% |  |  |  |
Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying value of debt |  |  | $ 144,000,000 |  | $ 144,000,000 | $ 195,000,000 |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  | $ 48,000,000 |  | 48,000,000 |  |  |  |  |
2018 Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 2 years |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | € | € 115,000,000 |  |  |  |  |  |  |  |  |
Extended maturity period |  |  | 2021-08 |  |  |  |  |  |  |
2012 Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, outstanding amount |  |  | $ 50,000,000 |  | 50,000,000 | 86,000,000 |  |  |  |
Debt instrument, term |  | 3 years |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 350,000,000 |  |  |  |  | $ 100,000,000 | $ 100,000,000 | $ 115,000,000 |
Outstanding amount of receivables sold to affiliate |  |  | $ 147,000,000 |  | $ 147,000,000 | $ 166,000,000 |  |  |  |
Debt, weighted average interest rate |  |  | 3.30% |  | 3.30% | 2.70% |  |  |  |
2017 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, outstanding amount |  |  | $ 0 |  | $ 0 |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  | 752,000,000 |  | 752,000,000 |  |  |  |  |
Letters of credit outstanding, amount |  |  | 48,000,000 |  | 48,000,000 |  |  |  |  |
Term Loan A due 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 250,000,000 |  | 250,000,000 |  |  |  |  |
Debt instrument, outstanding amount |  |  | 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Debt instrument, term |  |  |  |  | 3 years |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | May 17, 2020 |  |  |  |  |
Term Loan A due 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Debt instrument, outstanding amount |  |  | 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Debt instrument, term |  |  |  |  | 5 years |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | May 17, 2022 |  |  |  |  |
Debt Instrument, amortization percentage per annum (payable in equal quarterly installments) |  |  |  |  | 20.00% |  |  |  |  |
Repayment of debt, accelerated amortization |  |  |  |  | $ 1,000,000 |  |  |  |  |
Repayment of outstanding principal balance |  |  | 195,000,000 |  | $ 195,000,000 |  |  |  |  |
Debt instrument, maturity year |  |  |  |  | 2022 |  |  |  |  |
Carrying value of debt |  |  |  |  |  | $ 195,000,000 |  |  |  |
2017 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 5 years |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | 800,000,000 |  | $ 800,000,000 |  |  |  |  | $ 680,000,000
Line of credit facility, letter of credit sublimit |  |  | $ 125,000,000 |  | 125,000,000 |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  |  |  | 0.25% |  |  |
Payments of debt issuance costs |  |  |  |  | 1,000,000 |  | $ 15,000,000 |  |  |
Debt issuance costs immediately recognized |  |  |  |  |  |  | $ 2,000,000 |  |  |
Repayments of debt |  |  |  |  |  | 55,000,000 |  |  |  |
Carrying value of debt |  |  |  |  |  | 25,000,000 |  |  |  |
2017 Revolving Credit Facility [Member] | Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 250,000,000 |  |  |  |
Repayment of debt, accelerated amortization |  |  |  |  | $ 6,000,000 |  |  |  |  |
2017 Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  |  |  | 0.175% |  |  |
2017 Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  |  |  | 0.40% |  |  |
2017 Revolving Credit Facility [Member] | Maximum [Member] | Accounts Receivable Securitization [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of debt, accelerated amortization |  |  |  |  |  | 1,000,000 |  |  |  |
2017 Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments, percentage points added to variable rate |  |  | 1.75% |  | 1.75% |  |  |  |  |
2017 Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments, percentage points added to variable rate |  |  | 1.75% |  | 1.75% |  | 1.375% |  |  |
2017 Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments, percentage points added to variable rate |  |  | 2.00% |  | 2.00% |  | 2.50% |  |  |
2017 Revolving Credit Facility [Member] | Alternate base rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments, percentage points added to variable rate |  |  |  |  |  |  | 0.75% |  |  |
2017 Revolving Credit Facility [Member] | Alternate base rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments, percentage points added to variable rate |  |  |  |  |  |  | 0.375% |  |  |
2017 Revolving Credit Facility [Member] | Alternate base rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments, percentage points added to variable rate |  |  |  |  |  |  | 1.50% |  |  |
Term Loan B due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 600,000,000 |  | $ 600,000,000 |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | May 17, 2024 |  |  |  |  |
Debt Instrument, amortization percentage per annum (payable in equal quarterly installments) |  |  |  |  | 1.00% |  |  |  |  |
Repayment of debt, accelerated amortization |  |  |  |  | $ 5,000,000 |  |  |  |  |
Repayment of outstanding principal balance |  |  | $ 593,000,000 |  | $ 593,000,000 |  |  |  |  |
Debt instrument, maturity year |  |  |  |  | 2024 |  |  |  |  |
Carrying value of debt |  |  |  |  |  | 593,000,000 |  |  |  |
Term Loan B due 2024 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments, percentage points added to variable rate |  |  | 2.00% |  | 2.00% |  |  |  |  |
Term Loan B due 2024 [Member] | Alternate base rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instruments, percentage points added to variable rate |  |  | 1.00% |  | 1.00% |  |  |  |  |
2015 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of debt, accelerated amortization |  |  |  |  |  |  | $ 5,000,000 |  |  |
Medium-term Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 9.35% |  | 9.35% |  |  |  |  |
Debt instrument, maturity year |  |  |  |  | 2019 |  |  |  |  |
Carrying value of debt |  |  | $ 5,000,000 |  | $ 5,000,000 |  |  |  |  |
Senior Notes due 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 3.875% |  |  |
Debt instrument, maturity year |  |  |  |  |  |  | 2018 |  |  |
Carrying value of debt |  |  |  |  |  |  | $ 659,000,000 |  |  |
Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 3,000,000 |  | $ 39,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  | 4.75% |  | 4.75% |  | 4.75% |  |  |
Debt instrument, maturity year |  |  |  |  | 2022 |  |  |  |  |
Carrying value of debt |  |  | $ 1,080,000,000 |  | $ 1,080,000,000 | 1,083,000,000 |  |  |  |
Notes due 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 41,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  | 3.875% |  | 3.875% |  | 3.875% |  |  |
Notes due 2018 and 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on repurchase of debt instrument |  |  |  |  |  |  | $ (3,000,000) |  |  |
Notes due 2043 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 1,000,000 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 6.875% |  | 6.875% |  |  |  |  |
Debt instrument, maturity year |  |  |  |  | 2043 |  |  |  |  |
Carrying value of debt |  |  | $ 374,000,000 |  | $ 374,000,000 | 376,000,000 |  |  |  |
Other Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, outstanding amount |  |  | $ 81,000,000 |  | $ 81,000,000 | $ 83,000,000 |  |  |  |

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- Definition Cash repatriation. + References No definition available. + Details
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- Definition Consolidated interest coverage ratio. + References No definition available. + Details
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- Definition States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. + References No definition available. + Details
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- Definition Debt instrument maturity date extended month and year. + References No definition available. + Details
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- Definition Represents the percentage points added to the variable rate on a debt instrument. + References No definition available. + Details
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- Definition Represents debt issuance costs that did not qualify for capitalization and was therefore immediately expensed. + References No definition available. + Details
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- Definition Represents the sublimit on the revolving credit facility. + References No definition available. + Details
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- Definition The maximum consolidated leverage ratio permitted under the debt instruments. + References No definition available. + Details
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- Definition The minimum required consolidated interest coverage ratio under the debt instruments. + References No definition available. + Details
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- Definition The amount of outstanding receivables that have been sold to an affiliate. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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