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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Narrative (Details)
$ in Millions
36 Months Ended 60 Months Ended
Nov. 13, 2021
Nov. 13, 2023
Jun. 30, 2019
USD ($)
May 17, 2019
USD ($)
May 02, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 13, 2018
USD ($)
Jun. 30, 2018
USD ($)
Feb. 13, 2018
USD ($)
Mar. 22, 2016
USD ($)
Short-term Debt [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity     $ 7,300              
Revolving Credit Facilities due 2024 [Member]                    
Short-term Debt [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity     3,000       $ 3,000      
Revolving Credit Facilities due 2022 [Member]                    
Short-term Debt [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity     3,000       $ 3,000      
Revolving Credit Facilities due 2022 [Member] | Scenario, Forecast [Member]                    
Short-term Debt [Line Items]                    
Debt Instrument, Term 3 years 5 years                
Securities Sold under Agreements to Repurchase [Member]                    
Short-term Debt [Line Items]                    
Ratio of Indebtedness to Net Capital             0.60      
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member]                    
Short-term Debt [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity     1,300              
Percentage of outstanding amounts borrowed utilized as collateral                 105.00%  
Interest rate in addition to LIBOR                 0.75%  
Short-term borrowings and finance lease obligations     777     $ 0   $ 1,150 $ 1,300  
Accounts and Notes Receivable [Member] | Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member]                    
Short-term Debt [Line Items]                    
Line of Credit Facility, amount pledged as collateral     817              
Fair Value, Inputs, Level 2 [Member]                    
Short-term Debt [Line Items]                    
Long-term Debt, Fair Value     $ 117     $ 5,775   $ 9,425    
Senior Note Floating Rate Due 2020 [Member]                    
Short-term Debt [Line Items]                    
Debt Instrument, Face Amount       $ 750            
Term Loan Facility due 2020 [Member]                    
Short-term Debt [Line Items]                    
Long-term Line of Credit [1]         $ 3,000          
Line of Credit Facility, Maximum Borrowing Capacity [1]                   $ 4,500
[1]
The Term Loan Facility was amended in 2018 to extend the maturity date to June 2020 and the facility was repaid and terminated in May 2019.