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Variable Interest Entities - Variable Interests Held by Us and Our Maximum Exposure to Loss Rising From Our Involvements in Those VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Variable Interest Entity [Line Items]      
Assets $ 200,946 [1] $ 175,375 [1] $ 184,760
Liabilities [1] 182,606 157,119  
Variable Interest Entity, Not Primary Beneficiary, Structured Note Vehicles [Member]      
Variable Interest Entity [Line Items]      
Total Assets Held by Unconsolidated VIEs   1,524  
Assets   510  
Liabilities   9  
Maximum Exposure to Loss   1,515  
Variable Interest Entity, Not Primary Beneficiary, Limited Partnership Investments [Member]      
Variable Interest Entity [Line Items]      
Total Assets Held by Unconsolidated VIEs 2,654 2,160  
Assets 594 561  
Liabilities 285 300  
Maximum Exposure to Loss $ 594 562  
Variable Interest Entity, Not Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Total Assets Held by Unconsolidated VIEs   3,684  
Assets   1,071  
Liabilities   309  
Maximum Exposure to Loss   $ 2,077  
[1] Assets