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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Debt Redemptions/Repayments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 02, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
May 17, 2019
Mar. 22, 2019
Dec. 11, 2018
Jul. 01, 2018
Mar. 22, 2016
Debt Instrument [Line Items]                    
Debt Instrument, Repurchase Amount               $ 6,200    
Debt Securities               $ 4,400    
Long-term Debt, Gross             $ 1,530      
Line of Credit Facility, Maximum Borrowing Capacity   $ 7,300   $ 7,300            
Repayments of Long-term Debt, including breakage fees and all applicable accrued and unpaid interest $ 4,600                  
Loss on early extinguishment of debt   $ 13 $ 0 $ 13 $ 0          
Senior Subordinated Notes [Member]                    
Debt Instrument [Line Items]                    
Long-term Transition Bond                 $ 1,250  
Debt Instrument, Interest Rate, Stated Percentage                 6.00%  
Senior Note 2.20 Percent Due 2020 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage           2.20%        
Debt Instrument, Face Amount           $ 1,250        
4.625% Notes due 2020 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             4.625%      
Long-term Debt, Gross             $ 474      
3.625% Notes due 2021 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             3.625%      
Long-term Debt, Gross             $ 296      
4.250% Notes due 2021 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             4.25%      
Long-term Debt, Gross             $ 163      
2.800% Notes due 2023 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             2.80%      
Long-term Debt, Gross             $ 381      
6.500% Debentures due 2028 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             6.50%      
Long-term Debt, Gross             $ 57      
5.600% Senior Notes due 2036 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             5.60%      
Long-term Debt, Gross             $ 42      
4.900% Notes due 2041 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             4.90%      
Long-term Debt, Gross             $ 48      
4.150% Notes due 2043 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Interest Rate, Stated Percentage             4.15%      
Long-term Debt, Gross             $ 69      
Senior Note Floating Rate Due 2020 [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount           750        
SMR notes [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Repurchase Amount           $ 2,000        
Term Loan Facility due 2020 [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity [1]                   $ 4,500
Long-term Line of Credit [1] $ 3,000                  
[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.