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Held for Sale - Narrative (Details)
$ in Millions, € in Billions
3 Months Ended
Sep. 30, 2021
USD ($)
Jul. 05, 2021
USD ($)
Jul. 05, 2021
EUR (€)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets held for sale       $ 7 $ 12
Liabilities held for sale       5 9
Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets held for sale       7 12
Liabilities held for sale       $ 5 $ 9
European Businesses (Disposal Group) | Held-for-sale | Expected | Minimum          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Charge to remeasure to lower of carrying amount or fair value less costs to sell $ 500        
European Businesses (Disposal Group) | Held-for-sale | Expected | Maximum          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Charge to remeasure to lower of carrying amount or fair value less costs to sell $ 700        
European Businesses (Disposal Group) | Held-for-sale | Subsequent Event          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Purchase price   $ 1,500 € 1.2