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Equity - Share-based payments (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based compensation expense
Pre-tax compensation expense	$ 23	$ 18	$ 21
Income tax benefit	(2)	(2)	(3)
Total share-based compensation expense, net of income taxes	$ 21	16	18
Stock Incentive Plan
Shares authorized under Stock Incentive Plan	8.0
Shares available for future grants under Stock Incentive Plan	2.1
Stock options
Share-based compensation expense
Pre-tax compensation expense	$ 4	3	5
Income tax benefit			(1)
Total share-based compensation expense, net of income taxes	4	3	4
Restricted stock units (RSUs) | Employee
Share-based compensation expense
Pre-tax compensation expense	12	10	12
Income tax benefit	(1)	(2)	(2)
Total share-based compensation expense, net of income taxes	11	8	10
Performance shares and other share-based awards
Share-based compensation expense
Pre-tax compensation expense	7	5	4
Income tax benefit	(1)
Total share-based compensation expense, net of income taxes	$ 6	$ 5	$ 4

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