Stockholders' Equity - Narrative (Details) $ / shares in Units, £ in Millions, shares in Millions, $ in Millions, € in Billions		1 Months Ended			3 Months Ended
	Jul. 26, 2017 $ / shares	Jun. 30, 2017 USD ($)	Apr. 30, 2017 shares	Mar. 31, 2017 USD ($) shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2017 EUR (€) vote	Jun. 30, 2017 GBP (£) vote	Jun. 30, 2017 USD ($) vote
Accelerated Share Repurchases [Line Items]
Share of common stock outstanding, vote on proposals | vote							1	1	1
Dividends declared per common share (in dollars per share) | $ / shares					$ 0.28	$ 0.28
Authorized amount available for future repurchases									$ 2,500
Translation gain (loss) attributable to redeemable noncontrolling interest					$ 115	$ (67)
Reclassified to income statement, net of income tax expense of nil and nil					20
Long-term debt outstanding				$ 8,362					$ 7,949
Net actuarial losses attributable to redeemable noncontrolling interest					1	$ 1
Term Loan | Euro Denominated Notes
Accelerated Share Repurchases [Line Items]
Long-term debt outstanding | €							€ 1.2
Term Loan | British Pound Sterling Denominated Notes
Accelerated Share Repurchases [Line Items]
Long-term debt outstanding | £								£ 450
Net Investment Hedging
Accelerated Share Repurchases [Line Items]
Losses from net investment hedges recorded in other comprehensive income					$ 114
Accelerated Share Repurchase
Accelerated Share Repurchases [Line Items]
Common stock repurchased		$ 250		$ 250
Common stock repurchased (shares) | shares			0.3	1.4	1.2
Subsequent Event
Accelerated Share Repurchases [Line Items]
Dividends declared per common share (in dollars per share) | $ / shares	$ 0.34