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Stockholders' Equity - Narrative (Details) $ / shares in Units, £ in Millions, shares in Millions, € in Billions		1 Months Ended					3 Months Ended			9 Months Ended
	Jul. 26, 2017 $ / shares	Nov. 30, 2017 USD ($) $ / shares shares	Aug. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Apr. 30, 2017 shares	Mar. 31, 2017 USD ($) shares	Dec. 31, 2017 USD ($) $ / shares	Jun. 30, 2017 $ / shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2017 EUR (€) vote	Dec. 31, 2017 GBP (£) vote	Dec. 31, 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	$ 0.34						$ 0.34	$ 0.28	$ 0.28	$ 0.96	$ 0.84
Authorized amount available for future repurchases														$ 1,800,000,000
Translation gain (loss) attributable to redeemable noncontrolling interest							$ 12,000,000		$ (31,000,000)	$ 160,000,000	$ (97,000,000)
Losses reclassified to income statement, net of income tax expense											20,000,000
Losses from net investment hedges recorded in other comprehensive income							19,000,000		0	127,000,000	0
Long-term debt outstanding						$ 8,362,000,000								$ 8,045,000,000
Net actuarial losses attributable to redeemable noncontrolling interest							0		$ 2,000,000	1,000,000	$ 3,000,000
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							$ 28,000,000			$ 205,000,000
Accelerated Share Repurchase
Accelerated Share Repurchases [Line Items]
Common stock repurchased						$ 250,000,000
Common stock repurchased (shares) | shares					0.3	1.4
June 2017 ASR Program
Accelerated Share Repurchases [Line Items]
Common stock repurchased				$ 250,000,000
Common stock repurchased (shares) | shares										1.5
August 2017 ASR Program
Accelerated Share Repurchases [Line Items]
Common stock repurchased			$ 400,000,000
Common stock repurchased (shares) | shares										2.7
November 2017 Open Market Transactions
Accelerated Share Repurchases [Line Items]
Common stock repurchased		$ 250,000,000
Average price per share (in dollars per share) | $ / shares		$ 138.12
Common stock repurchased (shares) | shares		1.8

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