Organizational Efficiency Plan (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2013
Organizational Efficiency Plan Activity [Line Items]
Restructuring charge, net of tax			$ 40
Caption that includes restructuring charges		Other operating expenses
Organizational Efficiency Cost Reduction 2013 Plan [Member]
Organizational Efficiency Plan Activity [Line Items]
Charge	$ 60
Liability For Cost Reduction Initiative
Restructuring charge, net of tax	$ 40