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Variable Interest Entities (Changes in Level 3 Assets and Liabilities) (Details 2) - Consolidated investment entities [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]        
Transfers from Level 1 to Level 2, assets $ 0 $ 0 $ 0 $ 0
Transfers from Level 2 to Level 1, assets 0 0 0 0
Transfers from Level 1 to Level 2, liabilities 0 0 0 0
Transfers from Level 2 to Level 1, liabilities 0 0 0 0
Corporate debt securities [Member]        
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]        
Balance, at the beginning of the period   2   0
Sales   (2)   (2)
Transfers into Level 3       2
Balance, at the end of the period   0   0
Common stocks [Member]        
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]        
Balance, at the beginning of the period 11 4 4 5
Total gains (losses) included in net income [1]     4  
Purchases   3   3
Sales (4) (1) (4) (1)
Transfers into Level 3   1 4 2
Transfers out of Level 3 (3)   (4) (2)
Balance, at the end of the period 4 7 4 7
Changes in unrealized gains (losses) included in income relating to assets held at end of period [1]     2  
Transfers out of Level 3 from deconsolidation of collateralized loan obligations 2   2  
Syndicated loans [Member]        
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]        
Balance, at the beginning of the period 200 223 180 254
Total gains (losses) included in net income [1] (1) (2) 1 1
Purchases 24 72 42 127
Sales (35) (7) (36) (15)
Settlements (19) (30) (30) (53)
Transfers into Level 3 17 41 78 113
Transfers out of Level 3 (75) (112) (124) (242)
Balance, at the end of the period 111 185 111 185
Changes in unrealized gains (losses) included in income relating to assets held at end of period [1]   $ (3)   $ (1)
Transfers out of Level 3 from deconsolidation of collateralized loan obligations $ 24   $ 24  
[1] Included in net investment income in the Consolidated Statements of Operations.