Segment Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013 Segment	Jun. 30, 2012 Corporate & Other [Member] Segment, Divested Business [Member]	Jun. 30, 2012 Corporate & Other [Member] Segment, Divested Business [Member]	Jun. 30, 2012 Certain Individual Income Disability and Property & Casualty Products [Member]	Jun. 30, 2012 Certain Individual Income Disability and Property & Casualty Products [Member]	Jun. 30, 2012 South Asia and India Businesses [Member]	Jun. 30, 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		$ 6	$ 7	$ 28	$ 89	$ 4	$ 8
Prior period adjustment to operating earnings tax expense		$ 5	$ 5	$ 6	$ 25	$ 2	$ 4