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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Repurchase Facility and Revolving Credit Facilities (Details)
$ in Millions
36 Months Ended 60 Months Ended
Nov. 13, 2021
Nov. 13, 2023
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Nov. 13, 2018
USD ($)
Repurchase Agreements [Member]                
Line of Credit Facility [Line Items]                
Short-term borrowings         $ 1,300      
Revolving Credit Facilities due 2024 [Member]                
Line of Credit Facility [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity               $ 3,000
Revolving Credit Facilities due 2022 [Member]                
Line of Credit Facility [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity               $ 3,000
Long-term Line of Credit       $ 500        
Line of Credit Facility, Remaining Borrowing Capacity     $ 3,000          
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member]                
Line of Credit Facility [Line Items]                
Short-term borrowings     800     $ 0 $ 777  
Percentage of outstanding amounts borrowed utilized as collateral         105.00%      
Interest rate in addition to LIBOR         0.75%      
Revolving Credit Facilities due 2022 [Member]                
Line of Credit Facility [Line Items]                
Ratio of Indebtedness to Net Capital               0.60
Accounts and Notes Receivable [Member] | Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member]                
Line of Credit Facility [Line Items]                
Pledged Financial Instruments, Not Separately Reported, Loans Receivable Pledged as Collateral     $ 841          
Forecast [Member] | Revolving Credit Facilities due 2024 [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Term   5 years            
Forecast [Member] | Revolving Credit Facilities due 2022 [Member]                
Line of Credit Facility [Line Items]                
Debt Instrument, Term 3 years