Deferred Policy Acquisition Costs and Present Value of Future Profits (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred policy acquisition costs and present value of future profits	$ 798,000,000		$ 3,072,000,000
Deferred Sales Inducements, Amortization Expense	1,000,000	6,000,000
Individual Life [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Disposition of DAC Asset	(2,374,000,000)
Adjustments to Unrealized Gains and Losses on Securities Available for Sale and Other	(349,000,000)
Deferred Sales Inducements, Amortization Expense	49,000,000
Retirement Plans [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Disposition of DAC Asset	(352,000,000)
Adjustments to Unrealized Gains and Losses on Securities Available for Sale and Other	(148,000,000)
Deferred Sales Inducements, Amortization Expense	22,000,000
Retirement Plans and Individual Life Businesses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Disposition of DAC Asset	2,229,000,000	0
Deferred Sales Inducements, Amortization Expense	$ 71,000,000	$ 0