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Wireless Licenses, Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense for other intangible assets $ 557 $ 485 $ 1,091 $ 937
Remainder of 2018 1,084   1,084  
2019 1,927   1,927  
2020 1,605   1,605  
2021 1,326   1,326  
2022 1,100   1,100  
2023 $ 827   $ 827