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Revenue from Contracts with Customers Revenue from Contracts with Customers (In-Text) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Receivables for revenue from contracts with customers $ 638   $ 638   $ 657
Financial planning fees [Member]          
Disaggregation of Revenue [Line Items]          
Contract liabilities 129   129   134
Capitalized contract costs 105   105   109
Transaction and other fees [Member]          
Disaggregation of Revenue [Line Items]          
Contract liabilities 32   32   $ 0
Revenue from contracts with customers standard [Member]          
Disaggregation of Revenue [Line Items]          
Impact of fees previously recorded as a reduction of expenses $ 27 $ 27 $ 53 $ 51