Separate Accounts, Death Benefits and Other Insurance Benefit Features (Details 1) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 MAV Only [Member]	Mar. 31, 2013 With 5% rollup [Member]	Mar. 31, 2013 With Earnings Protection Benefit Rider (EPB) [Member]	Mar. 31, 2013 With 5% rollup & EPB [Member]	Mar. 31, 2013 Asset Protection Benefit ("APB") [Member]	Mar. 31, 2013 Lifetime Income Benefit ("LIB") - Death Benefit [Member]	Mar. 31, 2013 Reset [Member]	Mar. 31, 2013 Return of Premium ("ROP")/Other [Member]	Mar. 31, 2013 Guaranteed Minimum Death Benefit [Member] U.S. [Member]	Mar. 31, 2013 Guaranteed Minimum Death Benefit [Member] JAPAN [Member]	Mar. 31, 2013 Guaranteed Minimum Income Benefit [Member] JAPAN [Member]
Individual Variable and Group Annuity Account Value by GMDB/GMIB Type
Account Value (AV)	$ 27,235		$ 19,993	$ 1,597	$ 5,067	$ 578	$ 20,089	$ 1,064	$ 3,203	$ 21,912	$ 73,503	$ 15,737	$ 15,532
Net Amount at Risk (NAR)	4,460		3,448	318	576	118	605	17	104	179	5,365	1,290	1,093
Retained Net Amount at Risk (RNAR)	258		214	21	18	5	119	4	51	37	469	0	0
Weighted Average Attained Age of Annuitant			69 years	69 years	66 years	69 years	67 years	65 years	69 years	66 years	68 years	68 years	68 years
Less: General Account Value with U.S. GMDB	7,245
Subtotal Separate Account Liabilities with U.S. GMDB	66,258
Separate Account Liabilities without U.S. GMDB	78,881
Total Separate Account Liabilities	$ 145,139	$ 141,558