Acquisitions and Dispositions (Japan Income Tax Refund - Narrative) (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 Indemnification Agreement [Member] USD ($)	Sep. 30, 2013 American Life [Member] Japan [Member] USD ($)	Sep. 30, 2013 American Life [Member] Japan [Member] JPY (¥)
Business Acquisition [Line Items]
American Life income tax exam refund						$ 176	¥ 16,000
Net charge related to the indemnification provisions of the Stock Purchase Agreement			16
Other expenses	3,977	4,245	12,140	13,341	154
Other net investment gains (losses)	(51)	69	472	119	19
Provision for income tax expense (benefit)	$ 3	$ (53)	$ 308	$ 710	$ (119)