Shareowners' Equity and Noncontrolling Interest (Accelerated Stock Repurchase) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accelerated Share Repurchases [Line Items]
Stock Issued During Period, Value, Other	$ 0	$ 1,100	$ 0	$ 1,100
Stock Issued During Period, Shares, Other				11.3
March 13, 2015 ASR [Member]
Accelerated Share Repurchases [Line Items]
Accelerated Share Repurchases, Cash or Stock Settlement				On March 13, 2015, we entered into accelerated share repurchase (ASR) agreements to repurchase an aggregate of $2.65 billion of our common stock. Under the terms of the ASR agreements, we made the aggregate payments and received an initial delivery of 18.6 million shares of common stock, representing approximately 85% of the shares expected to be repurchased. On July 31, 2015, the shares associated with the remaining portion of the aggregate purchase were settled upon final delivery to us of approximately 4.2 million additional shares of common stock. Including the remaining shares settled on July 31, 2015, the final price under the ASR was $116.11 per share.
ASR Aggregate Purchase Price		2,650		$ 2,650
Stock Repurchased During Period, Shares				18.6
July 31, 2015 settlement of ASR [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchased During Period, Shares				4.2
Accelerated Share Repurchases, Final Price Paid Per Share				$ 116.11
November 11, 2015 ASR [Member]
Accelerated Share Repurchases [Line Items]
Accelerated Share Repurchases, Cash or Stock Settlement				On November 11, 2015, we entered into ASR agreements to repurchase an aggregate of $6 billion of our common stock utilizing the net after-tax proceeds from the sale of Sikorsky. The ASR agreements provide for the repurchase of our common stock based on the average of the daily volume-weighted average prices of our common stock during the term of such ASR agreements, less a discount and subject to adjustments pursuant to the terms and conditions of the ASR agreements. Under the terms of the ASR agreements, we made the aggregate payments and received an initial delivery of approximately 51.9 million shares of our common stock, representing approximately 85% of the shares expected to be repurchased. The shares associated with the remaining portion of the aggregate purchase price have been settled over six tranches. On January 19, 2016, the shares associated with the remaining portion of the first tranche of the aggregate purchase were settled upon final delivery to us of approximately 2.1 million shares of common stock. On September 14 and 15, 2016, the shares associated with the remaining portion of the remaining five tranches of the aggregate purchase were settled upon final delivery to us of approximately 8 million additional shares of common stock. Including the remaining shares associated with the six tranches settled in 2016, the final price under the November 11, 2015 ASR was $96.74 per share.
ASR Aggregate Purchase Price		$ 6,000		$ 6,000
Stock Repurchased During Period, Shares				51.9
January 19, 2016 settlement of ASR [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchased During Period, Shares			2.1
September 14 and 15, 2016 final settlement of ASR [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchased During Period, Shares			8.0
Accelerated Share Repurchases, Final Price Paid Per Share			$ 96.74