Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles [Abstract]
Beginning Balance of DAC	$ 15,240	$ 13,377	$ 13,551
Beginning Balance of VOBA	9,379	11,088	2,864
Capitalizations of DAC	5,289	5,558	2,770
Acquisitions of VOBA	55	11	9,210
Net investment gains (losses) of DAC	(40)	(478)	(92)
Net investment gains (losses) of VOBA	(1)	(49)	(16)
Other expenses of DAC	(2,875)	(2,614)	(1,875)
Other expenses of VOBA	(1,283)	(1,757)	(494)
Total amortization of DAC	(2,915)	(3,092)	(1,967)
Total amortization of VOBA	(1,284)	(1,806)	(510)
Unrealized investment gains (losses) of DAC	(516)	(427)	(1,043)
Unrealized investment gains (losses) of VOBA	(197)	(361)	(125)
Effect of foreign currency translation and other of DAC	52	(176)	66
Effect of foreign currency translation and other of VOBA	(342)	447	(351)
Ending Balance of DAC	17,150	15,240	13,377
Ending Balance of VOBA	7,611	9,379	11,088
Balance, end of period	$ 24,761	$ 24,619	$ 24,465