Equity - Share-based payments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based compensation expense
Pre-tax compensation expense	$ 8	$ 6	$ 15	$ 11
Income tax benefit	(1)	(1)	(2)	(1)
Total share-based compensation expense, net of income taxes	7	5	13	10
Employee Stock Option
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
RSU
Share-based compensation expense
Pre-tax compensation expense	3	3	6	6
Income tax benefit	(1)	(1)	(1)	(1)
Total share-based compensation expense, net of income taxes	2	2	5	5
Performance shares and other share-based awards
Share-based compensation expense
Pre-tax compensation expense	4	2	7	3
Income tax benefit			(1)
Total share-based compensation expense, net of income taxes	$ 4	$ 2	$ 6	$ 3