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Fair Value (Level 3) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Net OTTI loss, credit-related [1] $ (11) $ (11) $ (16)
Net amount of OTTI loss reclassified to/(from) other income/(loss) (3) (12) 6
Subtotal PLRMBS | Fair Value, Measurements, Recurring | Level 3 | Available-for-sale Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance, beginning of the period 3,157 3,833 4,489
Interest income 78 81 92
Net OTTI loss, credit-related (11) (11) (16)
Unrealized gain/(loss) of other-than-temporarily impaired securities included in AOCI (16) (38) 195
Net amount of OTTI loss reclassified to/(from) other income/(loss) (3) (12) 6
Settlements (609) (708) (933)
Transfers of HTM to AFS 1 12 0
Balance, end of the period 2,597 3,157 3,833
Total amount of gain/(loss) for the period included in earnings attributable to the change in unrealized gains/losses relating to assets and liabilities still held at the end of the period $ 62 $ 70 $ 75
[1]
For the years ended December 31, 2019, 2018, and 2017 “securities for which OTTI was previously recognized” represents all securities that were also other-than-temporarily impaired prior to January 1, 2019, 2018, and 2017, respectively.