Commitments and Contingencies - Schedule of Product Warranty Reserves (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 277	$ 320
Issuances/accruals during the period	145	159
Settlements made during the period/other	(147)	(201)
Balance at June 30	275	278
Current portion			$ 200	$ 212
Non-current portion			75	66
Total	277	320	275	278
Product Warranty
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at January 1	277	251
Issuances/accruals during the period	145	158
Settlements made during the period/other	(147)	(154)
Balance at June 30	275	255
Current portion			200	189
Non-current portion			75	66
Total	277	251	275	255
Legacy Product Warranty
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at January 1	0	69
Issuances/accruals during the period	0	1
Settlements made during the period/other	0	(47)
Balance at June 30	0	23
Current portion			0	23
Non-current portion			0	0
Total	$ 0	$ 69	$ 0	$ 23

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

No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Amount of increase in the standard and extended product warranty accrual from warranties issued.

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