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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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