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Investments AFS Securities by Major Type (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS [1] $ 16,427 $ 15,206
Allowance for Credit Losses (39)  
OTTI Recognized in AOCI   (9)
Gross Unrealized Gains 105 311
Gross Unrealized Losses (318) (13)
Available-for-sale (AFS) securities [2] 16,175 15,495
Available-for-Sale, Accrued Interest, after Allowance for Credit Loss 51 58
Subsequent Unrealized Gains in Fair Value of Previously OTTI Impaired AFS   277
Total MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS [1] 11,080 9,925
Allowance for Credit Losses (39)  
OTTI Recognized in AOCI   (9)
Gross Unrealized Gains 99 304
Gross Unrealized Losses (318) (13)
Available-for-sale (AFS) securities 10,822 10,207
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS 5,347 5,281
Allowance for Credit Losses 0  
OTTI Recognized in AOCI   0
Gross Unrealized Gains 6 7
Gross Unrealized Losses 0 0
Available-for-sale (AFS) securities 5,353 5,288
MBS – GSEs – multifamily: | MBS - GSEs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS [1] 8,848 7,596
Allowance for Credit Losses 0  
OTTI Recognized in AOCI   0
Gross Unrealized Gains 0 27
Gross Unrealized Losses (252) (13)
Available-for-sale (AFS) securities 8,596 7,610
Freddie Mac | MBS – GSEs – multifamily: | MBS - GSEs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS 857 773
Allowance for Credit Losses 0  
OTTI Recognized in AOCI   0
Gross Unrealized Gains 0 4
Gross Unrealized Losses (24) 0
Available-for-sale (AFS) securities 833 777
Fannie Mae | MBS – GSEs – multifamily: | MBS - GSEs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS 7,991 6,823
Allowance for Credit Losses 0  
OTTI Recognized in AOCI   0
Gross Unrealized Gains 0 23
Gross Unrealized Losses (228) (13)
Available-for-sale (AFS) securities 7,763 6,833
Residential Mortgage Backed Securities [Member] | PLRMBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS [1] 2,232 2,329
Allowance for Credit Losses (39)  
OTTI Recognized in AOCI   (9)
Gross Unrealized Gains 99 277
Gross Unrealized Losses (66) 0
Available-for-sale (AFS) securities 2,226 2,597
Residential Mortgage Backed Securities [Member] | Prime | PLRMBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS 204 213
Allowance for Credit Losses (6)  
OTTI Recognized in AOCI   0
Gross Unrealized Gains 2 17
Gross Unrealized Losses (2) 0
Available-for-sale (AFS) securities 198 230
Residential Mortgage Backed Securities [Member] | Alt-A | PLRMBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost of AFS 2,028 2,116
Allowance for Credit Losses (33)  
OTTI Recognized in AOCI   (9)
Gross Unrealized Gains 97 260
Gross Unrealized Losses (64) 0
Available-for-sale (AFS) securities $ 2,028 $ 2,367
[1]
Amortized cost includes unpaid principal balance, unamortized premiums and discounts, net charge-offs, and valuation adjustments for hedging activities, and excludes accrued interest receivable of $51 and $58 at March 31, 2020, and December 31, 2019, respectively.
[2]
At March 31, 2020, $643 of these securities were pledged as collateral that may be repledged. At December 31, 2019, $381 of these securities were pledged as collateral that may be repledged.