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Deferred Policy Acquisition Costs, Value of Business Acquired and Other Policy-Related Intangibles (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Insurance [Abstract]
Balance at January 1,	$ 1,264	$ 1,094	$ 792
Acquisitions	0	213	356
Amortization	(150)	(60)	(42)
Effect of foreign currency translation	(6)	17	(12)
Balance at December 31,	1,108	1,264	1,094
Accumulated Amortization	$ 334	$ 184	$ 124

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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