Organizational Efficiency Plan (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended		3 Months Ended															12 Months Ended		3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 After Tax [Member]	Sep. 30, 2012 After Tax [Member]	Dec. 31, 2013 Global Health Care [Member]	Sep. 30, 2012 Global Health Care [Member]	Dec. 31, 2013 Global Health Care [Member] After Tax [Member]	Sep. 30, 2012 Global Health Care [Member] After Tax [Member]	Dec. 31, 2013 Global Supplemental Benefits [Member]	Sep. 30, 2012 Global Supplemental Benefits [Member]	Dec. 31, 2013 Global Supplemental Benefits [Member] After Tax [Member]	Sep. 30, 2012 Global Supplemental Benefits [Member] After Tax [Member]	Dec. 31, 2013 Group Disability And Life [Member]	Sep. 30, 2012 Group Disability And Life [Member]	Dec. 31, 2013 Group Disability And Life [Member] After Tax [Member]	Sep. 30, 2012 Group Disability And Life [Member] After Tax [Member]	Sep. 30, 2012 Employee Severance [Member]	Dec. 31, 2013 Employee Severance [Member]	Dec. 31, 2012 Employee Severance [Member]	Sep. 30, 2012 Real Estate [Member]	Dec. 31, 2013 Real Estate [Member]	Dec. 31, 2012 Real Estate [Member]
Organizational Efficiency Plan Activity [Line Items]
Balance, January 1,		$ 71																	$ 67			$ 4
Charge	77	60		40	50	47	65	31	42	11	9	8	6	2	3	1	2	72	47		5	13
Payments		50	6																46	5		4	1
Balance, December 31,		$ 81	$ 71																$ 68	$ 67		$ 13	$ 4
Caption that includes restructuring charges		Other operating expenses Other operating expenses