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Equity - Share-based payments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based compensation expense
Pre-tax compensation expense	$ 6	$ 6	$ 10	$ 11
Income tax benefit	(1)	(1)	(1)	(2)
Total share-based compensation expense, net of income taxes	5	5	9	9
Stock options
Share-based compensation expense
Pre-tax compensation expense	1	2	2	3
Income tax benefit		(1)		(1)
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	5	6
Income tax benefit	(1)		(1)	(1)
Total share-based compensation expense, net of income taxes	2	3	4	5
Performance shares and other share-based awards
Share-based compensation expense
Pre-tax compensation expense	2	1	3	2
Total share-based compensation expense, net of income taxes	$ 2	$ 1	$ 3	$ 2

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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