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Derivative Financial Instruments - Carrying Value of Hedged Items in Fair Value Hedge (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Securities available-for-sale [Member]    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged items [1] $ 9,024 $ 7,277
Active hedged asset adjustments 963 554
Discontinued hedged asset adjustments 763 428
Total hedged asset adjustments 1,726 982
Deposits [Member]    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged liability items [1],[2] 5,252  
Active hedged liability adjustments [2] 252  
Discontinued hedged liability adjustments [2] 0  
Total hedged liability adjustments [2] 252  
Fixed-rate senior debt obligations recharacterized as time deposits 5,000  
Long-term Debt [Member]    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged liability items [1] 2,244 10,975
Active hedged liability adjustments 260 285
Discontinued hedged liability adjustments (16) (32)
Total hedged liability adjustments $ 244 $ 253
[1] The carrying amount of securities AFS represents the amortized cost basis.
[2] During the first nine months of 2020, $5.0 billion of fixed-rate senior debt obligations issued to HSBC North America were recharacterized as time deposits. The cumulative amount of fair value hedging adjustments associated with this debt was reclassified to deposits. See Note 14, "Related Party Transactions," for additional information.