XML 176 R90.htm IDEA: XBRL DOCUMENT v3.20.2
Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements $ 2,250  
Derivative Liability   $ 2,025
Total derivatives not subject to master netting or similar arrangement 3 53
Total 2,253  
Currency Swap    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements 209  
Derivative Liability [1]   208
Interest Rate Contract    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements 2,041  
Derivative Liability [1]   1,764
Total derivatives subject to master netting or similar arrangement    
Offsetting Liabilities [Line Items]    
Derivative Liability   1,972
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding $ 1,457 $ 1,300
[1] Letters of credit of approximately $1.5 billion and $1.3 billion were posted as collateral at September 30, 2020 and 2019, respectively, to partially secure the liability positions of one of the currency swaps and one of the interest rate swaps in accordance with the collateral requirements for these derivatives.