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Fair Value Measurements Fair Value Disclosure, Additional Information (Details) € in Millions, $ in Millions, ¥ in Billions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) Swap | Sep. 30, 2017 USD ($) | Sep. 30, 2018 EUR (€) Swap | Sep. 30, 2018 JPY (¥) Swap | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 JPY (¥) | Sep. 30, 2016 USD ($) Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain | $ 23 | $ 10 |  |  |  |  |
Net Realized and Unrealized Gain (Loss) on Trading Securities | $ 15 | 6 |  |  |  |  |
Number of fixed to floating interest rate swaps outstanding | Swap | 0 |  | 0 | 0 |  |  |
Debt Instrument, Fair Value Disclosure | $ 9,600 | 12,700 |  |  |  |  |
Proceeds from Sale and Maturity of Marketable Securities | 3 |  |  |  |  |  |
Marketable Securities, Realized Gain (Loss) | $ 2 |  |  |  |  |  |
1.4% Due in 2018 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.40% |  | 1.40% | 1.40% |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | ¥ |  |  |  | ¥ 35 |  | ¥ 35 |
Interest rate swaps | Two Point Six Percent Due Two Thousand Seventeen |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, Amount of Hedged Item |  |  |  |  |  |  | $ 400
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 2.60%
Number of fixed to floating interest rate swaps outstanding | Swap |  |  |  |  |  |  | 4
Interest rate swaps | 1.4% Due in 2018 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, Amount of Hedged Item |  |  |  |  |  |  | $ 300
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 1.40%
Number of fixed to floating interest rate swaps outstanding | Swap |  |  |  |  |  |  | 3
Interest rate swaps | 7.125 % Due in 2017 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, Amount of Hedged Item |  |  |  |  |  |  | $ 150
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 7.125%
Number of fixed to floating interest rate swaps outstanding | Swap |  |  |  |  |  |  | 1
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  | € 1,000 |  | € 1,000 |  |
500 million euro net investment hedge [Member] [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  | € 423 |  |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure | $ 1,000 | $ 4,100 |  |  |  |  |
Fair Value, Inputs, Level 1 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure | $ 8,600 |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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