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Variable Interest Entities - Carrying Value and Exposure of Non-Consolidated VIEs (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Carrying Value $ 26,175 $ 24,315
Maximum Loss Exposure 28,073 25,298
Investment funds    
Variable Interest Entity [Line Items]    
Carrying Value 593 571
Maximum Loss Exposure 594 594
Investment funds | Consolidated Entity Excluding Variable Interest Entities (VIE) | Related Party    
Variable Interest Entity [Line Items]    
Carrying Value 1,836 1,310
Maximum Loss Exposure 3,644 2,598
Investment funds | Consolidated Entity Excluding Variable Interest Entities (VIE) and Related Party    
Variable Interest Entity [Line Items]    
Carrying Value 633 699
Maximum Loss Exposure 1,242 1,036
Debt Securities [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) | Related Party    
Variable Interest Entity [Line Items]    
Carrying Value 1,234 713
Maximum Loss Exposure 1,321 792
Debt Securities [Member] | Consolidated Entity Excluding Variable Interest Entities (VIE) and Related Party    
Variable Interest Entity [Line Items]    
Carrying Value 21,879 21,022
Maximum Loss Exposure $ 21,272 $ 20,278