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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Narrative (Details)
$ in Millions
36 Months Ended
Mar. 22, 2019
Mar. 31, 2019
USD ($)
Feb. 07, 2019
USD ($)
Mar. 22, 2016
USD ($)
Repurchase Agreements [Member]        
Repurchase and Credit Facilities and Term Loans [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 1,300  
Term Loan Facility due 2020 [Member]        
Repurchase and Credit Facilities and Term Loans [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 4,500
Line of Credit Facility, Number of Borrowings   6    
Long-term Line of Credit   $ 3,000    
Line of Credit Facility, Remaining Borrowing Capacity   1,500    
Term Loan Facility due 2020 [Member] | Scenario, Forecast [Member]        
Repurchase and Credit Facilities and Term Loans [Line Items]        
Debt Instrument, Term 3 years      
Securities Sold under Agreements to Repurchase [Member]        
Repurchase and Credit Facilities and Term Loans [Line Items]        
Percentage of outstanding amounts borrowed utilized as collateral     105.00%  
Interest rate in addition to LIBOR     0.75%  
Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member]        
Repurchase and Credit Facilities and Term Loans [Line Items]        
Short-term debt   19    
Accounts and Notes Receivable, Net [Member] | Securities Sold under Agreements to Repurchase [Member] | Repurchase Agreements [Member]        
Repurchase and Credit Facilities and Term Loans [Line Items]        
Line of Credit Facility, amount pledged as collateral   $ 20    
Maximum [Member] | Term Loan Facility due 2020 [Member]        
Repurchase and Credit Facilities and Term Loans [Line Items]        
Line of Credit Facility, Number of Borrowings       7