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Equity - Share-based payments (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based compensation expense
Pre-tax compensation expense	$ 23	$ 23	$ 18
Income tax benefit	(2)	(2)	(2)
Total share-based compensation expense, net of income taxes	$ 21	21	16
Stock Incentive Plan
Shares authorized under Stock Incentive Plan	8.0
Additional shares authorized under Stock Incentive Plan	2.5
Shares available for future grants under Stock Incentive Plan	3.8
Employee Stock Option [Member]
Share-based compensation expense
Pre-tax compensation expense	$ 3	4	3
Total share-based compensation expense, net of income taxes	3	4	3
RSU | Employee
Share-based compensation expense
Pre-tax compensation expense	12	12	10
Income tax benefit	(1)	(1)	(2)
Total share-based compensation expense, net of income taxes	11	11	8
Performance shares and other share-based awards
Share-based compensation expense
Pre-tax compensation expense	8	7	5
Income tax benefit	(1)	(1)
Total share-based compensation expense, net of income taxes	$ 7	$ 6	$ 5

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