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Fair Value Measurements (Details 7) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Non-Recurring Fair Value Measurements    
Impairment to equity method investments $ 0 $ 0
Gain on mortgage loans, net    
Unrealized gains (losses) related to assets and liabilities included in Condensed Consolidated Balance Sheets    
Unrealized Gain or Loss for Level 3 Fair Value instruments 17 17
Change in fair value of mortgage servicing rights    
Unrealized gains (losses) related to assets and liabilities included in Condensed Consolidated Balance Sheets    
Unrealized Gain or Loss for Level 3 Fair Value instruments (18) (165)
Interest rate lock commitments | Gain on mortgage loans, net    
Realized and unrealized gains and losses related to assets and liabilities    
Realized and Unrealized Gain or Loss from Level 3 Fair Value instruments 261 309
Mortgage loans held for sale | Gain on mortgage loans, net    
Realized and unrealized gains and losses related to assets and liabilities    
Realized and Unrealized Gain or Loss from Level 3 Fair Value instruments 1 (8)
Mortgage loans held for sale | Mortgage interest income    
Realized and unrealized gains and losses related to assets and liabilities    
Realized and Unrealized Gain or Loss from Level 3 Fair Value instruments 5 5
Mortgage servicing rights | Change in fair value of mortgage servicing rights    
Realized and unrealized gains and losses related to assets and liabilities    
Realized and Unrealized Gain or Loss from Level 3 Fair Value instruments (187) (320)
Level Two    
Debt    
Fair value of debt 1,300 2,000
Level Two | Market based approach    
Debt    
Fair value of debt 743  
Level Two | Observable spreads and terms for recent pricing of similar instruments    
Debt    
Fair value of debt 583  
Non-recurring basis | Level Three    
Non-Recurring Fair Value Measurements    
Repurchase and foreclosure-related charges $ 6 $ (2)