Segment Information (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2015 Segment	Jun. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of segments | Segment		6
Corporate Benefit Funding
Segment Reporting Information [Line Items]
Prior Period Reclassification Adjustment	$ (11)		$ (26)
Prior Period Adjustment To Operating Earnings Tax Expense	(14)		(22)
Corporate & Other
Segment Reporting Information [Line Items]
Prior Period Reclassification Adjustment	22		48
Prior Period Adjustment To Operating Earnings Tax Expense	80		153
Retail
Segment Reporting Information [Line Items]
Prior Period Reclassification Adjustment	25		49
Prior Period Adjustment To Operating Earnings Tax Expense	(45)		(89)
Group, Voluntary & Worksite Benefits
Segment Reporting Information [Line Items]
Prior Period Reclassification Adjustment	4		6
Prior Period Adjustment To Operating Earnings Tax Expense	3		4
Latin America
Segment Reporting Information [Line Items]
Prior Period Reclassification Adjustment	(24)		(49)
Prior Period Adjustment To Operating Earnings Tax Expense	(14)		(30)
Asia
Segment Reporting Information [Line Items]
Prior Period Reclassification Adjustment	5		10
Prior Period Adjustment To Operating Earnings Tax Expense	1		2
Europe, Middle East And Africa Segment
Segment Reporting Information [Line Items]
Prior Period Reclassification Adjustment	(21)		(38)
Prior Period Adjustment To Operating Earnings Tax Expense	$ (11)		$ (18)