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Stockholders' Equity - Share Repurchase Activity (Details) - Common Stock - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Shares repurchased (in shares)	3.3	2.4	0.2
Average price of stock repurchased (in dollars per share)	$ 150.31	$ 173.19	$ 161.16

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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Number of shares that have been repurchased during the period and are being held in treasury.

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-Topic 505
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