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Equity - Treasury stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions			3 Months Ended		12 Months Ended
	Feb. 05, 2019	Nov. 05, 2018	Mar. 31, 2019	Feb. 05, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 22, 2018
Treasury stock:
Purchase/acquisition of treasury stock (in shares)					0
Additional Paid-in Capital
Treasury stock:
Repurchases of common stock (in dollars)			$ (32)			$ (32)	$ 33
Treasury Stock
Treasury stock:
Purchase/acquisition of treasury stock (in shares)							5,847
Repurchases of common stock (in dollars)			$ (31)			$ (31)	$ 624
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)		$ 423		$ 392
VWAP (in dollars per share)	$ 98.04			$ 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

X

- Definition

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

+ References

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- Definition

Volume-weighted average price of shares.

+ References

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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-SubTopic 10
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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.

+ References

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- Definition

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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