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Equity - Share-based payments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based compensation expense
Pre-tax compensation expense	$ 6	$ 4	$ 18	$ 14
Income tax benefit	(1)		(2)	(1)
Total share-based compensation expense, net of income taxes	5	4	16	13
Stock options
Share-based compensation expense
Pre-tax compensation expense	1		3	2
Total share-based compensation expense, net of income taxes	1		3	2
Restricted stock units (RSUs)
Share-based compensation expense
Pre-tax compensation expense	3	2	9	7
Income tax benefit			(1)	(1)
Total share-based compensation expense, net of income taxes	3	2	8	6
Performance shares and other share-based awards
Share-based compensation expense
Pre-tax compensation expense	2	2	6	5
Income tax benefit	(1)		(1)
Total share-based compensation expense, net of income taxes	$ 1	$ 2	$ 5	$ 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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