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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Repurchase Facility and Revolving Credit Facilities (Details)
$ in Millions
9 Months Ended 36 Months Ended 60 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Nov. 13, 2021
Nov. 13, 2023
Feb. 09, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Nov. 13, 2018
USD ($)
Line of Credit Facility [Line Items]                
Proceeds from debt $ 419 $ 2,434            
Repayments of Long-term Debt 1 879            
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]                
Line of Credit Facility [Line Items]                
Short-term borrowings         $ 1,000      
Percentage of outstanding amounts borrowed utilized as collateral         105.00%      
Interest rate in addition to LIBOR         0.85%      
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member]                
Line of Credit Facility [Line Items]                
Short-term borrowings 550 $ 1,175       $ 0    
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 $ 578              
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