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Equity - Treasury stock (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 22, 2018
Treasury stock:
Purchase/acquisition of treasury stock (in shares)	500			0	765	0
Treasury Stock [Member]
Treasury stock:
Repurchases of common stock (in dollars)	$ 44	$ 10	$ 14		$ 68
2018 Stock Repurchase Program
Treasury stock:
Shares authorized to be repurchased (in shares)							8,000

X

- Definition

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

+ References

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- Definition

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

+ References

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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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