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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |
Stock Repurchased and Retired During Period, Value | $ 651 |
Repurchases and retirements of ordinary shares |  | $ 467
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 3,900 |
Parent |  |
Equity, Class of Treasury Stock [Line Items] |  |
Stock Repurchased and Retired During Period, Value | 651 |
Repurchases and retirements of ordinary shares |  | 467
Accounting Standards Update 2014-09 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | 45
Accounting Standards Update 2014-09 [Member] | Parent |  |
Equity, Class of Treasury Stock [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax | 0 | 45
Accounting Standards Update 2016-16 [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | 546
Accounting Standards Update 2016-16 [Member] | Parent |  |
Equity, Class of Treasury Stock [Line Items] |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 0 | $ 546

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