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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | May 01, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  | $ 1,000 |  | $ 1,000 |  |  |  | $ 8,500 |  |
Share tender offer to purchase up to $4.0 billion of ordinary shares |  |  |  |  |  |  | $ 4,000 |  |  |
Share tender offer, price per share | $ 39.25 |  |  |  |  |  |  |  |  |
Share Tender Offer, Accepted Shares | 102 |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  | $ 4,035 |  |  |  |  |
Ordinary shares, par value | $ 0.01 |  |  |  | $ 0.01 |  |  |  | $ 0.01 |
Repurchase of ordinary shares | $ 87 |  | $ 56 |  | $ 1,087 | $ 255 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 5,400 |  |  |  | 5,400 |  |  |  |  |
Deferred tax asset from stock options exercised and restricted stock vestings |  |  |  | $ 179 |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Repurchase of ordinary shares |  |  | $ 56 |  |  | 255 |  |  |  |
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 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share tender offer, price per share | $ 36.00 |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share tender offer, price per share | $ 40.00 |  |  |  |  |  |  |  |  |

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