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Variable Interest Entities - Summary of Variable Interest Entities Information (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Total Assets $ 176,203 $ 170,336
Total Liabilities 158,569 152,355
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total Assets 364 351
Total Liabilities 1 1
Variable Interest Entity, Not Primary Beneficiary | LIHTC investments    
Variable Interest Entity [Line Items]    
Total Assets 7,034 6,914
Total Liabilities 2,857 2,765
Maximum Exposure to Loss 1,811 1,823
Variable Interest Entity, Not Primary Beneficiary | Principal Investments, Indirect    
Variable Interest Entity [Line Items]    
Total Assets 10,583 10,899
Total Liabilities 165 168
Maximum Exposure to Loss $ 67 $ 78