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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
Mar. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Variable Interest Held Classified as Assets $ 2,337 $ 2,331
Variable Interests Held Classified as Liabilities 257 268
Total Assets in Unconsolidated VIEs 5,003 4,997
Maximum Exposure to Loss 3,547 3,541
Structured note vehicles [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Held Classified as Assets 1,803 1,803
Variable Interests Held Classified as Liabilities 7 6
Total Assets in Unconsolidated VIEs 3,020 3,019
Maximum Exposure to Loss 3,013 3,013
Limited partnership investments [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Held Classified as Assets 420 412
Variable Interests Held Classified as Liabilities 250 262
Total Assets in Unconsolidated VIEs 1,571 1,566
Maximum Exposure to Loss 420 412
Refinancing SPE [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Held Classified as Assets 114 116
Variable Interests Held Classified as Liabilities 0 0
Total Assets in Unconsolidated VIEs 412 412
Maximum Exposure to Loss $ 114 $ 116