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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Finance Receivables, Net (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Gross receivables	$ 3,795			$ 4,003
Unearned income	(414)			(439)
Subtotal	3,381			3,564
Residual values	0			0
Allowance for doubtful accounts	(93)	$ (93)	$ (93)	(92)	$ (107)	$ (107)	$ (108)	$ (108)
Finance receivables, net	3,288			3,472
Less: Billed portion of finance receivables, net	106			105
Less: Current portion of finance receivables not billed, net	1,145			1,218
Finance receivables due after one year, net	$ 2,037			$ 2,149