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Equity - Share-based payments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based compensation expense
Pre-tax compensation expense	$ 4	$ 6	$ 15	$ 18
Income tax benefit		(1)	(1)	(2)
Total share-based compensation expense, net of income taxes	4	5	14	16
Employee Stock Option [Member]
Share-based compensation expense
Pre-tax compensation expense	1	1	3	3
Total share-based compensation expense, net of income taxes	1	1	3	3
Restricted Stock Units (RSUs) [Member]
Share-based compensation expense
Pre-tax compensation expense	2	3	8	9
Income tax benefit			(1)	(1)
Total share-based compensation expense, net of income taxes	2	3	7	8
Performance shares and other share-based awards
Share-based compensation expense
Pre-tax compensation expense	1	2	4	6
Income tax benefit		(1)		(1)
Total share-based compensation expense, net of income taxes	$ 1	$ 1	$ 4	$ 5

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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