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Supplementary Financial Information - Other Long-Term Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]    
Internal use software, net $ 173 $ 163
Deferred contract costs, net 73 76
Product software, net 84 72
Cloud computing implementation costs, net 33 33
Other 111 69
Other long-term assets $ 474 $ 413