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Long term retention program ("LTRP") - Long Term Retention Program Accrued Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	$ 39	$ 24	$ 122	$ 59
LTRP 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	0	1	0	(3)
LTRP 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	1	1	3	(2)
LTRP 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	4	5	13	12
LTRP 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	5	5	15	14
LTRP 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	5	5	17	16
LTRP 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	9	7	31	22
LTRP 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total LTRP	$ 15	$ 0	$ 43	$ 0

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

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