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Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 120	$ 627	$ 133	$ 683
Acquired balance from Vivint Smart Home	0	0	22	0
Provision for credit losses	85	52	165	103
Write-offs	(59)	(50)	(203)	(171)
Recoveries collected	9	9	30	23
Other	3	0	11	0
Ending balance	$ 158	$ 638	$ 158	$ 638

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- Definition

Accounts Receivable, Allowance for Credit Loss Acquired in Acquisition

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- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of increase in allowance for credit loss on accounts receivable, from recovery.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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