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Fair Value Measurements - Changes in Level 3 Net Derivative Assets (Liabilities) (Details) (Guaranteed Minimum Income Benefit [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Guaranteed Minimum Income Benefit [Member]
       
Fair Value, Net Derivative Asset (Liability), Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance $ 21 $ 18 $ 10 $ (548)
Gains (losses) included in shareholders' net income:        
GMIB fair value gain/(loss) 0 0 0 0
Other 1 1 12 2
Total gains (losses) included in shareholders' net income 1 1 12 2
Gains (losses) included in other comprehensive income 0 0 0 0
Gains (losses) required to adjust future policy benefits for settlement annuities 0 [1] 0 [1] 0 [1] 0 [1]
Purchases, issuances, settlements:        
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 2 4 2 569
Total purchases, sales, settlements 2 4 2 569
Transfers into/(out of) Level 3:        
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Transfers into/out of Level 3 0 0 0 0
Ending balance 24 23 24 23
Total gains (losses) included in income attributable to instruments held at the reporting date $ 1 $ 1 $ 12 $ 2
[1] Amounts do not accrue to shareholders.