Dispositions (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]			Gain (Loss) on Disposition of Business
Sale | France
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash payment				$ 28
Pre-tax loss	$ 28
Sale | Belgium
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash payment		$ 3
Pre-tax loss		$ 6
Sale | United Kingdom
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash payment					$ 19
Pre-tax loss			$ 215
Net carrying value					$ 206
Sale | Netherlands
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Settlement gain (loss)	46
Reduction in revenue	42
Pre-tax impairment charges			$ 19
Sale | European energy marketing business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Settlement gain (loss)	(5)
Total settlement consideration	$ 5