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Equity - Treasury stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions				12 Months Ended
	Feb. 06, 2019	Feb. 05, 2019	Nov. 05, 2018	Dec. 31, 2021	Dec. 31, 2019	Oct. 22, 2018
Additional Paid-in Capital
Treasury stock:
Repurchases of common stock (in dollars)					$ (32)
Treasury Stock
Treasury stock:
Purchase/acquisition of treasury stock (in shares)				765
Repurchases of common stock (in dollars)				$ 68	$ (31)
ASR agreement
Treasury stock:
Payment made for repurchase of shares			$ 455
Purchase/acquisition of treasury stock (in shares)	4,000		4,000
Repurchases of common stock (in dollars)	$ 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)						8,000

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- Definition

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

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Volume-weighted average price of shares.

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- Definition

The cash outflow to reacquire common stock during the period.

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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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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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