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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | May 01, 2019 | Apr. 30, 2019 | Sep. 30, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax asset from stock options exercised and restricted stock vestings |  |  |  | $ 179 |  |  |  |  |
Stock repurchase program, authorized amount | $ 8,500 | $ 1,000 |  | $ 1,000 | $ 8,500 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | 533 |  | $ 49 |  | 1,000 | $ 199 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 1,000 |  |  |  | 1,000 |  |  |  |
Post Merger Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 1,000
Parent |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 533 |  | $ 49 |  | 1,000 | 199 |  |  |
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 |  | 45 |  |  | 45 | 0 |  |  |
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 |  | $ 546 |  |  | $ 546 | $ 0 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  | $ 8,500 |
Share tender offer to purchase up to $4.0 billion of ordinary shares |  |  |  |  |  |  | $ 4,000 |  |
Minimum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Share tender offer, price per share |  |  |  |  |  |  | $ 36.00 |  |
Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Share tender offer, price per share |  |  |  |  |  |  | $ 40.00 |  |

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