Separate Accounts, Death Benefits and Other Insurance Benefit Features (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 3,795
Net Amount at Risk by Product and Guarantee, General Account Value	25,845
Variable separate accounts	55,298	57,463
Equity securities (including mutual funds) [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Variable separate accounts	50,866	52,858
Cash and cash equivalents [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Variable separate accounts	4,432	4,605
Guaranteed Minimum Income Benefit [Member] | JAPAN
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	164
Net Amount at Risk by Product and Guarantee, General Account Value	$ 16,309