Shareowners' Equity and Noncontrolling Interest (Accelerated Stock Repurchase) (Details) - USD ($) shares in Millions, $ in Billions	3 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
November 11, 2015 ASR [Member]
Accelerated Share Repurchases [Line Items]
ASR Aggregate Purchase Price			$ 6
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