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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2018	Nov. 05, 2018	Jul. 11, 2018	Oct. 10, 2017
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)	16,844
Value of treasury stock acquired	$ 1,153,511
Average cost of treasury stock (usd per share)	$ 68.48
Stock repurchase additional authorization amount			$ 1,389,999
Prior shares under repurchase authorization (in shares)				110,001
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Remaining repurchase authorized amount		$ 1,355,605

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Stock Repurchase Program, Additional Authorized Amount

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Amount remaining of a stock repurchase plan authorized.

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

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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