Finance Receivables, Net - Summary (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross receivables	$ 3,596	$ 3,691
Unearned income	(384)	(393)
Total	3,212	3,298
Residual values	0	0
Allowance for doubtful accounts	(135)	(133)	$ (146)	$ (89)
Finance receivables, net	3,077	3,165
Less: Billed portion of finance receivables, net	92	99
Less: Current portion of finance receivables not billed, net	1,065	1,082
Finance receivables due after one year, net	$ 1,920	$ 1,984
Finance receivables lease portfolio -low - years	2 years
Finance lease portfolio average maturity - high - years	3 years
Credit Concentration Risk \| Financing Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Concentration risk (percentage)	4.20%	4.00%

Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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

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Amount of fee received for commitment to originate or purchase financing receivable where likelihood of commitment being exercised is remote. Excludes financing receivable covered under loss sharing agreement.

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Amount, after allowance for credit loss, of financing receivable, classified as current. Includes, but is not limited to, notes and loan receivable.

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