Fair Value Measurements (Fair Value Hierarchy Classification) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended																								6 Months Ended	12 Months Ended	6 Months Ended
	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2014 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member]	Jun. 30, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Quoted price in active markets (Level 1) [Member]	Jun. 30, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Unobservable inputs (Level 3) [Member]	Jun. 30, 2014 Portion at Other than Fair Value Measurement [Member]	Dec. 31, 2013 Portion at Other than Fair Value Measurement [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Quoted price in active markets (Level 1) [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Quoted price in active markets (Level 1) [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Unobservable inputs (Level 3) [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Unobservable inputs (Level 3) [Member]	Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member]	Dec. 31, 2013 Fair Value, Measurements, Nonrecurring [Member]	Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Quoted price in active markets (Level 1) [Member]	Dec. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Quoted price in active markets (Level 1) [Member]	Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Unobservable inputs (Level 3) [Member]	Dec. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Unobservable inputs (Level 3) [Member]	Jun. 30, 2014 Pratt and Whitney [Member]	Jun. 30, 2014 Pratt and Whitney [Member]	Jun. 30, 2014 Sikorsky [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Method Investment, Other than Temporary Impairment																										$ 60	$ 85	$ 28
Available-for-sale securities										921	988	921	988	0	0	0	0
Derivative Assets										132	90	0	0	132	90	0	0
Derivative Liabilities										(118)	(157)	0	0	(118)	(157)	0	0
Business Dispositions																		44	66	0	0	44	66	0	0
Long-term receivables			911	586	0	911	0	966	655
Customer financing notes receivable			281	366	0	281	0	288	394
Short Term borrowings			(407)	(388)	0	(230)	(177)	(407)	(388)
Long-term debt (excluding capitalized leases)			(22,012)	(21,525)	0	(21,676)	(336)	(19,627)	(19,807)
Long-term liabilities			(295)	(253)	0	(295)	0	(297)	(283)
Gain (Loss) on Disposition of Business	$ 38	$ 193