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Organizational Efficiency Plan (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2012	Dec. 31, 2013
Organizational Efficiency Plan Activity [Line Items]
Balance, January 1,	$ 81			$ 71
Charge		60	77
Payments	12			50
Ending balance	69	81		81
Caption that includes restructuring charges	Other operating expenses
After Tax [Member]
Organizational Efficiency Plan Activity [Line Items]
Charge		40	50
Global Health Care [Member]
Organizational Efficiency Plan Activity [Line Items]
Charge
Global Health Care [Member] \| After Tax [Member]
Organizational Efficiency Plan Activity [Line Items]
Charge
Global Supplemental Benefits [Member]
Organizational Efficiency Plan Activity [Line Items]
Charge
Global Supplemental Benefits [Member] \| After Tax [Member]
Organizational Efficiency Plan Activity [Line Items]
Charge
Group Disability And Life [Member]
Organizational Efficiency Plan Activity [Line Items]
Charge
Group Disability And Life [Member] \| After Tax [Member]
Organizational Efficiency Plan Activity [Line Items]
Charge
Employee Severance [Member]
Organizational Efficiency Plan Activity [Line Items]
Balance, January 1,	68			67
Charge		47
Payments	11			46
Ending balance	57	68		68
Real Estate [Member]
Organizational Efficiency Plan Activity [Line Items]
Balance, January 1,	13			4
Charge		13
Payments	1			4
Ending balance	$ 12	$ 13		$ 13