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Commercial Paper and Long-term Debt (Narrative) (Details)
3 Months Ended 12 Months Ended
Jul. 02, 2017
USD ($)
Dec. 31, 2019
USD ($)
lenders
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Nov. 30, 2015
USD ($)
Long-term Debt [Line Items]            
Net payments on commercial paper   $ 300,000,000 $ 0 $ (300,000,000)    
Commercial paper   $ 0 $ 300,000,000      
Commercial Paper, Weighted Average Interest Rate     2.954%      
Commercial Paper, Weighted Average Original Maturity Period     16 days      
Commercial paper, maximum original maturity period   90 days        
Repayments of Debt $ 591,000,000          
Loss on repayment of long-term debt 39,000,000 $ 0 $ 0 (39,000,000)    
Loss on repayment of long-term debt, net of tax $ 25,000,000          
Line of Credit Facility, Maximum Borrowing Capacity         $ 1,250,000,000 $ 1,250,000,000
Debt Instrument, Basis Spread on Variable Rate   0.805%        
Number of highly rated lenders | lenders   20        
Aggregate Maximum Percentage Of Any Single Lender   10.00%        
Borrowings outstanding on long-term line of credit   $ 0 0      
Outstanding letters of credit   $ 0 0      
Ratio of indebtedness to net capital   0.280        
Total payments for interest on commercial paper and long-term debt   $ 193,000,000 $ 194,000,000 $ 214,000,000    
Maximum [Member]            
Long-term Debt [Line Items]            
Ratio of indebtedness to net capital   0.60