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Equity - Treasury stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			3 Months Ended
	Feb. 06, 2019	Nov. 05, 2018	Mar. 31, 2019	Feb. 06, 2019	Feb. 05, 2019	Oct. 22, 2018	Dec. 12, 2014
Additional Paid-in Capital
Treasury stock:
Repurchases of common stock, net			$ 32
Treasury Stock
Treasury stock:
Repurchases of common stock, net			$ 31
ASR agreement
Treasury stock:
Payment made for repurchase of shares		$ 455
Purchase/acquisition of treasury stock (in shares)		4.0			4.0
Repurchases of common stock, net		$ (423)		$ (392)
VWAP (in dollars per share)					$ 98.04
Amount of cash returned from upfront payment in repurchase of stock	$ 63
2018 Stock Repurchase Program
Treasury stock:
Shares authorized to be repurchased (in shares)						8.0
2014 Stock Repurchase Program
Treasury stock:
Shares authorized to be repurchased (in shares)							5.0

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- Definition

The cash inflow from return of upfront payment in repurchase of stock.

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- Definition

The cash outflow to reacquire common stock during the period.

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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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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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