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Derivatives and Hedging Activities (Cumulative Basis Adjustments for Fair Value Hedges) (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Advances [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Hedged Asset, Fair Value Hedge $ 31,457 [1]
Hedged Asset, Active Fair Value Hedge, Cumulative Increase (Decrease) 801
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 14
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) 815
Unsecured Debt [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Hedged Liability, Fair Value Hedge 25,139 [1]
Hedged Liability,Active Fair Value Hedge, Cumulative Increase (Decrease) 29
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (1)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ 28
[1] Includes only the portion of amortized cost representing the hedged items in fair value hedging relationships.