v3.19.2
Intangible Assets - Carrying Amounts of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]        
Indefinite-lived intangible assets, Beginning balance     $ 17,578  
Indefinite-lived intangible assets, Ending balance $ 17,578   17,578  
Finite-lived intangible assets, Beginning balance     261  
Finite-lived intangible assets, amortization expense (25) $ (11) (40) $ (22)
Finite-lived intangible assets, acquisition [1]     678  
Finite-lived intangible assets, Ending balance 899   899  
Intangible assets, Beginning balance     17,839  
Intangible assets, Ending balance $ 18,477   $ 18,477  
[1] In connection with the eFront Transaction, which closed on May 10, 2019, the Company acquired $452 million of finite-lived customer relationships, $205 million of finite-lived technology-related intangible assets and $21 million of a finite-lived trade name, with weighted-average estimated lives of approximately 11 years, eight years and five years, respectively. See Note 3, Acquisition, for information on the eFront Transaction.