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Business Acquisitions and Divestitures - Divestitures and Other (Details)
£ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Apr. 06, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Apr. 06, 2022
GBP (£)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
European businesses, disposal group, losses (gains)     $ 0 $ (35)  
E.U. Businesses (Disposal Group) | Disposed of by sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
European businesses, disposal group, losses (gains)   $ 23   $ 35  
U.K. Disposal Group (Disposal Group) | Disposed of by sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gross purchase price $ 144       £ 110
Proceeds from collection of notes receivable 118        
International Segment | Disposed of by sale | Aurelius Elephant Limited          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Divested net assets 615        
Accumulated other comprehensive loss adjustment $ 731