Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 152	$ 145	$ 133
Provision for credit losses	272	314	251
Write-offs	(343)	(363)	(313)
Recoveries collected	46	38	39
Other	19	18	13
Ending balance	146	152	145
Vivint Smart Home
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Acquired balance	$ 0	$ 0	$ 22