Intangible Assets (Value Of Business Acquired (VOBA) Roll-forward) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Movement in Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Roll Forward]
Balance, beginning of year	$ 676	$ 634	$ 748
Acquisition of New York Life's Korea operations and Hong Kong operations	0	151	0
Amortization expense	(82)	(108)	(111)
Foreign exchange revaluation	20	(1)	(3)
Balance, end of year	$ 614	$ 676	$ 634