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Held-to-Maturity Securities (Classification of Held-to-Maturity Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] $ 7,546 $ 11,092    
OTTI Recognized in AOCI [1] (1) (3)    
HTM securities, Carrying Value [1],[2] 7,545 11,089    
Gross Unrecognized Holding Gain 40 31    
Gross Unrecognized Holding Loss (19) (73)    
HTM Securities, Fair Value 7,566 11,047    
Credit-related OTTI 1,021 1,077 $ 1,129 $ 1,183
California Housing Finance Agency (CalHFA) bonds        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1]   100    
OTTI Recognized in AOCI [1]   0    
HTM securities, Carrying Value [1]   100    
Gross Unrecognized Holding Gain   0    
Gross Unrecognized Holding Loss   (3)    
HTM Securities, Fair Value   97    
Ginnie Mae        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 470 609    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value 470 [3] 609 [1]    
Gross Unrecognized Holding Gain 5 0    
Gross Unrecognized Holding Loss 0 (6)    
HTM Securities, Fair Value 475 603    
MBS - GSEs        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 6,691 9,791    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value [1] 6,691 9,791    
Gross Unrecognized Holding Gain 28 23    
Gross Unrecognized Holding Loss (13) (55)    
HTM Securities, Fair Value 6,706 9,759    
Total MBS        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1]   10,992    
OTTI Recognized in AOCI [1]   (3)    
HTM securities, Carrying Value [1]   10,989    
Gross Unrecognized Holding Gain   31    
Gross Unrecognized Holding Loss   (70)    
HTM Securities, Fair Value   10,950    
Held-to-maturity Securities, Premiums 8 14    
Held-to-maturity Securities, Discounts (11) (19)    
Total MBS | Held-to-maturity Securities        
Schedule of Held-to-maturity Securities [Line Items]        
Credit-related OTTI 7 7    
MBS – GSEs – single-family: | MBS - GSEs        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 2,907 4,104    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value [1] 2,907 4,104    
Gross Unrecognized Holding Gain 28 23    
Gross Unrecognized Holding Loss (2) (37)    
HTM Securities, Fair Value 2,933 4,090    
MBS – GSEs – multifamily: | MBS - GSEs        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 3,784 5,687    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value [1] 3,784 5,687    
Gross Unrecognized Holding Gain 0 0    
Gross Unrecognized Holding Loss (11) (18)    
HTM Securities, Fair Value 3,773 5,669    
Freddie Mac | MBS – GSEs – single-family: | MBS - GSEs        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 1,063 1,506    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value [1] 1,063 1,506    
Gross Unrecognized Holding Gain 8 6    
Gross Unrecognized Holding Loss (1) (21)    
HTM Securities, Fair Value 1,070 1,491    
Freddie Mac | MBS – GSEs – multifamily: | MBS - GSEs        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 2,625 3,944    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value 2,625 [1] 3,944    
Gross Unrecognized Holding Gain 0 0    
Gross Unrecognized Holding Loss (9) (17)    
HTM Securities, Fair Value 2,616 3,927    
Fannie Mae | MBS – GSEs – single-family: | MBS - GSEs        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 1,844 2,598    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value [1] 1,844 2,598    
Gross Unrecognized Holding Gain 20 17    
Gross Unrecognized Holding Loss (1) (16)    
HTM Securities, Fair Value 1,863 2,599    
Fannie Mae | MBS – GSEs – multifamily: | MBS - GSEs        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 1,159 1,743    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value 1,159 [1] 1,743    
Gross Unrecognized Holding Gain 0 0    
Gross Unrecognized Holding Loss (2) (1)    
HTM Securities, Fair Value 1,157 1,742    
Residential Mortgage Backed Securities | PLRMBS        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 385 592    
OTTI Recognized in AOCI [1] (1) (3)    
HTM securities, Carrying Value [1] 384 589    
Gross Unrecognized Holding Gain 7 8    
Gross Unrecognized Holding Loss (6) (9)    
HTM Securities, Fair Value 385 588    
Residential Mortgage Backed Securities | Prime | PLRMBS        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost [1] 243 383    
OTTI Recognized in AOCI [1] 0 0    
HTM securities, Carrying Value [1] 243 383    
Gross Unrecognized Holding Gain 1 1    
Gross Unrecognized Holding Loss (4) (6)    
HTM Securities, Fair Value 240 378    
Residential Mortgage Backed Securities | Alt-A [Member] | PLRMBS        
Schedule of Held-to-maturity Securities [Line Items]        
Amortized Cost 142 209 [1]    
OTTI Recognized in AOCI (1) (3) [1]    
HTM securities, Carrying Value 141 206 [1]    
Gross Unrecognized Holding Gain 6 7    
Gross Unrecognized Holding Loss (2) (3)    
HTM Securities, Fair Value $ 145 $ 210    
[1]
Amortized cost includes unpaid principal balance, unamortized premiums and discounts, and previous OTTI recognized in earnings. The carrying value of HTM securities represents amortized cost after adjustment for non-credit-related OTTI recognized in AOCI.
[2]
At December 31, 2019 and 2018, none of these securities were pledged as collateral that may be repledged.
[3]
Amortized cost includes unpaid principal balance, unamortized premiums and discounts, and previous OTTI recognized in earnings. The carrying value of HTM securities represents amortized cost after adjustment for non-credit-related OTTI recognized in AOCI.