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Long term retention program ("LTRP") - Long Term Retention Program Accrued Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	$ 36	$ 5	$ 83	$ 35
LTRP 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	0	(3)	0	(4)
LTRP 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	0	(3)	2	(3)
LTRP 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	4	1	9	7
LTRP 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	4	2	10	9
LTRP 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	5	3	12	11
LTRP 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	9	5	22	15
LTRP 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	$ 14	$ 0	$ 28	$ 0

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Amount of cost capitalized for award under share-based payment arrangement.

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