Commitments and Contingencies (Schedule of Product Warranty Reserves) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 235	$ 191
Issuances/accruals during the period	141	134
Settlements made during the period	(149)	(143)
Balance at June 30	227	182
Current portion			$ 176	$ 143
Non-current portion			51	39
Total	$ 235	$ 191	$ 227	$ 182