Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Segment	Mar. 31, 2012 Corporate & Other [Member] Segment, Divested Business [Member]	Mar. 31, 2012 Certain Individual Income Disability and Property & Casualty Products [Member]	Mar. 31, 2012 South Asia and India Businesses [Member]
Segment Information [Abstract]
Number of segments	6
Segment Reporting Information [Line Items]
Prior period operating earnings reclassifications to conform with current period presentation		$ 1	$ 61	$ 4
Prior period adjustment to operating earnings tax expense		$ 0	$ 19	$ 2