v3.19.3.a.u2
Acquisitions, Dispositions And Other Adjustments (Held-For-Sale) (Narrative) (Details) - Puerto Rico and U.S. Virgin Islands Wireline and Wireless Operations [Member] - Disposal Group, Held-for-sale, Not Discontinued Operations [Member] - Spectrum Licenses [Member] - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2019
Dec. 31, 2019
Assets Held-For-Sale [Line Items]    
Date of agreement Oct. 31, 2019  
Assets held-for-sale transaction price   $ 1,950
Timing of Disposal   We expect the transaction to close in the first half of 2020, subject to customary closing conditions.
Other Current Assets [Member]    
Assets Held-For-Sale [Line Items]    
Property, plant and equipment - net   $ 700
Indefinite-lived Intangible Assets   1,100
Goodwill   300
Accounts Payable and Accrued Liabilities [Member]    
Assets Held-For-Sale [Line Items]    
Net tax liabilities   $ 400