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Available-for-Sale Securities (AFS Securities by Major Security Type) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost [1] $ 15,206 $ 6,676
OTTI Recognized in AOCI (9) (20)
Gross Unrealized Gains 311 309
Gross Unrealized Losses (13) (34)
Estimated Fair Value [2] 15,495 6,931
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5,281  
OTTI Recognized in AOCI 0  
Gross Unrealized Gains 7  
Gross Unrealized Losses 0  
Estimated Fair Value 5,288  
Total MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost [1] 9,925  
OTTI Recognized in AOCI (9)  
Gross Unrealized Gains 304  
Gross Unrealized Losses (13)  
Estimated Fair Value 10,207  
MBS – GSEs – multifamily: | MBS - GSEs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost [1] 7,596 3,806
OTTI Recognized in AOCI 0 0
Gross Unrealized Gains 27 0
Gross Unrealized Losses (13) (32)
Estimated Fair Value 7,610 3,774
Residential Mortgage Backed Securities | PLRMBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost [1] 2,329 2,870
OTTI Recognized in AOCI (9) (20)
Gross Unrealized Gains 277 309
Gross Unrealized Losses 0 (2)
Estimated Fair Value 2,597 3,157
Residential Mortgage Backed Securities | PLRMBS | Prime    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 213 267
OTTI Recognized in AOCI 0 0
Gross Unrealized Gains 17 21
Gross Unrealized Losses 0 0
Estimated Fair Value 230 288
Residential Mortgage Backed Securities | PLRMBS | Alt-A    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,116 2,603
OTTI Recognized in AOCI (9) (20)
Gross Unrealized Gains 260 288
Gross Unrealized Losses 0 (2)
Estimated Fair Value 2,367 2,869
Freddie Mac | MBS – GSEs – multifamily: | MBS - GSEs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 773 409
OTTI Recognized in AOCI 0 0
Gross Unrealized Gains 4 0
Gross Unrealized Losses 0 (2)
Estimated Fair Value 777 407
Fannie Mae | MBS – GSEs – multifamily: | MBS - GSEs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 6,823 3,397
OTTI Recognized in AOCI 0 0
Gross Unrealized Gains 23 0
Gross Unrealized Losses (13) (30)
Estimated Fair Value $ 6,833 $ 3,367
[1]
Amortized cost includes unpaid principal balance, unamortized premiums and discounts, previous OTTI recognized in earnings, and valuation adjustments for hedging activities.
[2]
At December 31, 2019, $381 of these securities were pledged as collateral that may be repledged. At December 31, 2018, none of these securities were pledged as collateral that may be repledged.