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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Allowance for credit losses
Allowance for credit losses, beginning of period	$ 78
Allowance for credit losses, end of period	70
Equipment Installment Plan Receivable
Allowance for credit losses
Allowance for credit losses, beginning of period	78	$ 84
Bad debts expense	21	34
Write-offs, net of recoveries	(29)	(43)
Allowance for credit losses, end of period	$ 70	$ 75

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

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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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