Shareowners' Equity and Noncontrolling Interest Shareowners' Equity and Noncontrolling Interest (Debt Remarketing) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Common Stock issued - equity unit remarketing	$ 1,100	$ 0	$ 1,100	$ 0
Junior subordinated notes 1.778% due 2018 [Member]
Debt Instrument [Line Items]
Common Stock issued - equity unit remarketing	$ 1,100
Long Term Debt Remarketing, Number of Shares Issued	11.3