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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 816 |  |  | $ 1,467 |
Repurchases and retirements of ordinary shares |  | $ 533 |  |  | $ 1,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 3,100 |  |  | 3,100 |
Parent |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 816 |  |  | 1,467 |
Repurchases and retirements of ordinary shares |  | $ 533 |  |  | 1,000
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Accounting Pronouncement |  |  |  |  | 45
Accounting Standards Update 2014-09 [Member] | Parent |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Accounting Pronouncement |  |  | $ 45 | 0 | 45
Accounting Standards Update 2016-16 [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Accounting Pronouncement |  |  |  |  | 546
Accounting Standards Update 2016-16 [Member] | Parent |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Accounting Pronouncement |  |  | $ 546 | $ 0 | $ 546

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