Shareowners' Equity and Noncontrolling Interest Shareowners' Equity and Noncontrolling Interest (Accelerated Stock Repurchase) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
March 13, 2015 ASR [Member]
Accelerated Share Repurchases [Line Items]
ASR Aggregate Purchase Price	$ 2,650
Accelerated Share Repurchases, Cash or Stock Settlement	18600000
July 31, 2015 settlement of ASR [Member]
Accelerated Share Repurchases [Line Items]
Accelerated Share Repurchases, Cash or Stock Settlement	4200000
November 11, 2015 ASR [Member]
Accelerated Share Repurchases [Line Items]
ASR Aggregate Purchase Price	$ 6,000
Accelerated Share Repurchases, Cash or Stock Settlement	51900000
January 19, 2016 settlement of ASR [Member]
Accelerated Share Repurchases [Line Items]
Accelerated Share Repurchases, Cash or Stock Settlement	2100000