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Equity - Share-based payments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based compensation expense
Pre-tax compensation expense	$ 6	$ 6	$ 11	$ 12
Income tax benefit	(1)		(1)	(1)
Total share-based compensation expense, net of income taxes	5	6	10	11
Stock options
Share-based compensation expense
Pre-tax compensation expense	1	1	2	2
Total share-based compensation expense, net of income taxes	1	1	2	2
Restricted stock units (RSUs)
Share-based compensation expense
Pre-tax compensation expense	3	3	6	6
Income tax benefit	(1)		(1)	(1)
Total share-based compensation expense, net of income taxes	2	3	5	5
Performance shares and other share-based awards
Share-based compensation expense
Pre-tax compensation expense	2	2	3	4
Total share-based compensation expense, net of income taxes	$ 2	$ 2	$ 3	$ 4

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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
-Paragraph 1
-Subparagraph (b)
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