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Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Jan. 01, 2016
Significant Accounting Policies [Line Items]            
Assets of managed investment entities $ 4,767   $ 4,767   $ 4,765  
Liabilities of managed investment entities $ 4,506   $ 4,506   $ 4,549  
Weighted average common shares adjustment related to stock-based compensation (shares) 1,900,000 1,600,000 2,000,000 1,600,000    
Anti-dilutive potential common shares related to stock-based compensation plans (shares) 0 200,000 0 600,000    
Maturities of short term investments     3 months      
Retained Earnings | Maximum            
Significant Accounting Policies [Line Items]            
Cumulative effect of accounting change           $ 1
New collateralized loan obligation temporary warehousing entities            
Significant Accounting Policies [Line Items]            
Assets of managed investment entities $ 383   $ 383      
Liabilities of managed investment entities $ 316   $ 316