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Recently Completed Divestiture of the Latin American Business and Planned Divestiture of ILEC Businesses - Pre-tax Net Income (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pretax net income (loss) $ 263 $ 196 $ 590 $ 369
Latin American Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pretax net income (loss) 95 47 178 75
ILEC Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pretax net income (loss) $ 168 $ 149 $ 412 $ 294