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Equity - Treasury stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions				3 Months Ended		9 Months Ended
	Feb. 06, 2019	Feb. 05, 2019	Nov. 05, 2018	Sep. 30, 2020	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Oct. 22, 2018
Treasury stock:
Purchase/acquisition of treasury stock (in shares)				0.0		0.0
Additional Paid-in Capital
Treasury stock:
Repurchases of common stock, net					$ 32		$ 32
Treasury Stock
Treasury stock:
Repurchases of common stock, net					$ 31		$ 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	$ (392)		$ (423)
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

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- Definition

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

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- Definition

Volume-weighted average price of shares.

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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- Definition

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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- Definition

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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