Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 127	$ 120	$ 145	$ 133
Acquired balance from Vivint Smart Home	0	0	0	22
Provision for credit losses	95	85	228	165
Write-offs	(74)	(59)	(252)	(203)
Recoveries collected	9	9	28	30
Other	7	3	15	11
Ending balance	$ 164	$ 158	$ 164	$ 158