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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Repurchase Facility and Revolving Credit Facilities (Details)
$ in Millions
3 Months Ended 36 Months Ended 60 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Nov. 13, 2021
Nov. 13, 2023
Feb. 09, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 13, 2018
USD ($)
Line of Credit Facility [Line Items]              
Proceeds from debt $ 419 $ 875          
Repayments of Long-term Debt 0 1          
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 30 $ 30       $ 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 $ 32            
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