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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Allowance for credit losses
Allowance for credit losses, beginning of period	$ 72
Allowance for credit losses, end of period	74
Equipment Installment Plan Receivable
Allowance for credit losses
Allowance for credit losses, beginning of period	72	$ 78
Bad debts expense	37	13
Write-offs, net of recoveries	(35)	(19)
Allowance for credit losses, end of period	$ 74	$ 72

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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