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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Derivative [Line Items] |  |  |  |  |
Derivative liabilities | $ 2,609 |  | $ 2,609 |  | $ 2,568
Derivative assets | 65 |  | 65 |  | 97
Fair value of long term debt | 7,000 |  | 7,000 |  | 7,600
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of long term debt | 6,800 |  | 6,800 |  | 7,400
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of long term debt | 200 |  | 200 |  | $ 200
Marketable Securities [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized gains (losses) | (32) | $ 21 | (22) | $ (1) |
Marketable Securities [Member] | Restricted investments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized gains (losses) | (32) | 20 |  |  |
Deferred compensation plan assets [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized gains (losses) | $ (10) | $ 7 | $ (7) | $ (2) |

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