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Revenue from Contracts with Customers Revenue from Contracts with Customers (In-Text) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Receivables for revenue from contracts with customers $ 638   $ 657
Financial planning fees [Member]      
Disaggregation of Revenue [Line Items]      
Contract liabilities 133   134
Capitalized contract costs 107   109
Transaction and other fees [Member]      
Disaggregation of Revenue [Line Items]      
Contract liabilities 48   $ 0
Revenue from contracts with customers standard [Member]      
Disaggregation of Revenue [Line Items]      
Impact of fees previously recorded as a reduction of expenses $ 26 $ 24