Commitments and Contingencies (Schedule of Product Warranty Reserves) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 277	$ 320
Issuances/accruals during the period	85	87
Settlements made during the period/other	(83)	(115)
Balance at March 31	279	292
Current portion			$ 202	$ 227
Non-current portion			77	65
Total	277	320	279	292
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	85	87
Settlements made during the period/other	(83)	(89)
Balance at March 31	279	249
Current portion			202	184
Non-current portion			77	65
Total	277	251	279	249
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	0
Settlements made during the period/other	0	(26)
Balance at March 31	0	43
Current portion			0	43
Non-current portion			0	0
Total	$ 0	$ 69	$ 0	$ 43

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.

+ References

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-Publisher FASB
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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. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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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.

+ References

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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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