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Fair Value Measurements (Level 3 Quantitative Information) (Details) - Level 3 - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Mortgage servicing rights | Weighted Average            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 10.40% 10.90%        
Prepay rate (as a percent) 12.30% 15.00%        
Recurring            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Assets $ 558 $ 545 $ 542 $ 495 $ 533 $ 505
Fair value, Liabilities (120) (166) (152) (176) (196) (199)
Recurring | DOJ litigation settlement            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Liabilities (84) (82) (82) (78) (94) (93)
Recurring | Rate lock commitments            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Liabilities 30 31 55 51 21 10
Recurring | Second mortgage            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Assets 48 53 50 59 62 65
Recurring | Mortgage servicing rights            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Assets 317 258 $ 279 $ 290 $ 320 $ 285
Discounted cash flows | Recurring | Long-term debt            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Liabilities $ (36) $ (84)        
Discounted cash flows | Recurring | Long-term debt | Lower range            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 7.20% 6.40%        
Prepay rate (as a percent) 14.40% 16.00%        
Weighted average life (in years) 4 months 24 days 6 months        
Discounted cash flows | Recurring | Long-term debt | Upper range            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 10.80% 9.60%        
Prepay rate (as a percent) 21.60% 24.00%        
Weighted average life (in years) 7 months 6 days 8 months 12 days        
Discounted cash flows | Recurring | Long-term debt | Weighted Average            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 9.00% 8.00%        
Prepay rate (as a percent) 18.00% 20.00%        
Weighted average life (in years) 6 months 7 months 12 days        
Discounted cash flows | Recurring | DOJ litigation settlement            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Liabilities $ (84) $ (82)        
Discounted cash flows | Recurring | DOJ litigation settlement | Lower range            
Fair Value Inputs [Abstract]            
Asset growth rate (as a percent) 4.40% 4.40%        
MSR growth rate (as a percent) 0.90% 0.90%        
Return on assets (ROA) improvement rate (as a percent) 0.02% 0.02%        
Peer group return on assets (as a percent) 0.50% 0.50%        
Discounted cash flows | Recurring | DOJ litigation settlement | Upper range            
Fair Value Inputs [Abstract]            
Asset growth rate (as a percent) 6.60% 6.60%        
MSR growth rate (as a percent) 1.40% 1.40%        
Return on assets (ROA) improvement rate (as a percent) 0.04% 0.04%        
Peer group return on assets (as a percent) 0.80% 0.80%        
Discounted cash flows | Recurring | DOJ litigation settlement | Weighted Average            
Fair Value Inputs [Abstract]            
Asset growth rate (as a percent) 5.50% 5.50%        
MSR growth rate (as a percent) 1.20% 1.20%        
Return on assets (ROA) improvement rate (as a percent) 0.03% 0.03%        
Peer group return on assets (as a percent) 0.70% 0.70%        
Discounted cash flows | Recurring | Second mortgage            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Assets $ 48 $ 53        
Discounted cash flows | Recurring | Second mortgage | Lower range            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 7.20% 7.20%        
Prepay rate (as a percent) 12.80% 11.30%        
CDR rate (as a percent) 2.50% 2.40%        
Discounted cash flows | Recurring | Second mortgage | Upper range            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 10.80% 10.80%        
Prepay rate (as a percent) 19.20% 17.00%        
CDR rate (as a percent) 3.80% 3.60%        
Discounted cash flows | Recurring | Second mortgage | Weighted Average            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 9.00% 9.00%        
Prepay rate (as a percent) 16.00% 14.20%        
CDR rate (as a percent) 3.10% 3.00%        
Discounted cash flows | Recurring | HELOC loans            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Assets $ 93 $ 132        
Discounted cash flows | Recurring | HELOC loans | Lower range            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 8.70% 8.00%        
Prepay rate (as a percent)   7.20%        
CDR rate (as a percent)   6.60%        
Loss severity (as a percent) 32.50% 60.20%        
Discounted cash flows | Recurring | HELOC loans | Upper range            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 13.10% 12.00%        
Prepay rate (as a percent)   10.80%        
CDR rate (as a percent)   9.90%        
Loss severity (as a percent) 48.70% 90.20%        
Discounted cash flows | Recurring | HELOC loans | Weighted Average            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 10.90% 10.00%        
Prepay rate (as a percent)   9.00%        
CDR rate (as a percent)   8.30%        
Loss severity (as a percent) 40.60% 75.20%        
Discounted cash flows | Recurring | Mortgage servicing rights            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Assets $ 317 $ 258        
Discounted cash flows | Recurring | Mortgage servicing rights | Lower range            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 6.60% 7.10%        
Prepay rate (as a percent) 10.00% 12.20%        
Weighted average cost to service per loan $ 58 $ 67        
Discounted cash flows | Recurring | Mortgage servicing rights | Upper range            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 9.80% 10.70%        
Prepay rate (as a percent) 14.40% 17.10%        
Weighted average cost to service per loan $ 87 $ 88        
Discounted cash flows | Recurring | Mortgage servicing rights | Weighted Average            
Fair Value Inputs [Abstract]            
Discount rate (as a percent) 8.20% 8.90%        
Prepay rate (as a percent) 12.30% 15.00%        
Weighted average cost to service per loan $ 72 $ 78        
Consensus pricing | Recurring | Rate lock commitments            
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]            
Fair value, Liabilities $ 30 $ 31        
Consensus pricing | Recurring | Rate lock commitments | Lower range            
Fair Value Inputs [Abstract]            
Origination pull-through rate (as a percent) 67.40% 66.20%        
Consensus pricing | Recurring | Rate lock commitments | Upper range            
Fair Value Inputs [Abstract]            
Origination pull-through rate (as a percent) 101.00% 99.30%        
Consensus pricing | Recurring | Rate lock commitments | Weighted Average            
Fair Value Inputs [Abstract]            
Origination pull-through rate (as a percent) 84.20% 82.70%