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Equity - Share-based payments (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based compensation expense
Pre-tax compensation expense	$ 18	$ 21	$ 26
Income tax benefit	(2)	(3)	(8)
Total share-based compensation expense, net of income taxes	$ 16	18	18
Stock Incentive Plan
Shares authorized under Stock Incentive Plan	8.0
Shares available for future grants under Stock Incentive Plan	2.8
Stock options
Share-based compensation expense
Pre-tax compensation expense	$ 3	5	7
Income tax benefit		(1)	(2)
Total share-based compensation expense, net of income taxes	3	4	5
Restricted stock units (RSUs)
Share-based compensation expense
Pre-tax compensation expense	10	12	13
Income tax benefit	(2)	(2)	(4)
Total share-based compensation expense, net of income taxes	8	10	9
Performance shares and other share-based awards
Share-based compensation expense
Pre-tax compensation expense	5	4	6
Income tax benefit			(2)
Total share-based compensation expense, net of income taxes	$ 5	$ 4	$ 4

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