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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
Jun. 30, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Variable Interest Held Classified as Assets $ 2,256 $ 2,331
Variable Interests Held Classified as Liabilities 290 268
Total Assets in Unconsolidated VIEs 4,599 4,997
Maximum Exposure to Loss 3,466 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 3,023 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 453 412
Variable Interests Held Classified as Liabilities 283 262
Total Assets in Unconsolidated VIEs 1,576 1,566
Maximum Exposure to Loss $ 453 412
Refinancing SPE [Member]    
Variable Interest Entity [Line Items]    
Variable Interest Held Classified as Assets   116
Variable Interests Held Classified as Liabilities   0
Total Assets in Unconsolidated VIEs   412
Maximum Exposure to Loss   $ 116