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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
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]    
Total Assets Held by Unconsolidated VIEs $ 3,684 $ 4,611
Variable Interest Held Classified as Assets 1,071 2,257
Variable Interests Held Classified as Liabilities 309 229
Maximum Exposure to Loss 2,077 3,457
Structured note vehicles [Member]    
Variable Interest Entity [Line Items]    
Total Assets Held by Unconsolidated VIEs 1,524 3,033
Variable Interest Held Classified as Assets 510 1,803
Variable Interests Held Classified as Liabilities 9 20
Maximum Exposure to Loss 1,515 3,003
Limited partnership investments [Member]    
Variable Interest Entity [Line Items]    
Total Assets Held by Unconsolidated VIEs 2,160 1,578
Variable Interest Held Classified as Assets 561 454
Variable Interests Held Classified as Liabilities 300 209
Maximum Exposure to Loss $ 562 $ 454