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Summary of Significant Accounting Policies - Goodwill (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2023
USD ($)
Goodwill [Roll Forward]  
Balance beginning of period $ 1,650
Goodwill resulting from the acquisition of Vivint Smart Home 3,494
Sale of business (2)
Foreign currency translation adjustments 1
Balance end of period 5,143
Texas  
Goodwill [Roll Forward]  
Balance beginning of period 710
Goodwill resulting from the acquisition of Vivint Smart Home 0
Sale of business 0
Foreign currency translation adjustments 0
Balance end of period 710
East  
Goodwill [Roll Forward]  
Balance beginning of period 723
Goodwill resulting from the acquisition of Vivint Smart Home 0
Sale of business (2)
Foreign currency translation adjustments 0
Balance end of period 721
West/Services/Other  
Goodwill [Roll Forward]  
Balance beginning of period 217
Goodwill resulting from the acquisition of Vivint Smart Home 0
Sale of business 0
Foreign currency translation adjustments 1
Balance end of period 218
Vivint Smart Home  
Goodwill [Roll Forward]  
Balance beginning of period 0
Goodwill resulting from the acquisition of Vivint Smart Home 3,494
Sale of business 0
Foreign currency translation adjustments 0
Balance end of period $ 3,494