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Variable Interest Entities Variable Interest Entities - Effect of Consolidating Investment Vehicles on Cash Flows (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Variable Interest Entity [Line Items]    
Effect on cash flows from operating activities $ (445) $ (198)
Effect on cash flows from investing activities 733 631
Effect on cash flows from financing activities 9 (343)
Total effect on cash flows $ 290 $ 90