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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Debt Redemptions/Repayments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended 37 Months Ended
May 02, 2019
Dec. 11, 2018
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Aug. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
May 17, 2019
Mar. 22, 2019
Nov. 13, 2018
Jul. 01, 2018
Mar. 22, 2016
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 1,530      
Repayments of Long-term Debt, including breakage fees and all applicable accrued and unpaid interest $ 4,600                          
Loss on Extinguishment of Debt     $ (13) $ (81) $ 0 $ 0 $ (13) $ (81)            
Line of Credit Facility, Maximum Borrowing Capacity             $ 6,000              
Long-term Line of Credit $ 3,000                          
Term Loan Facility due 2020 [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Term                 3 years          
Line of Credit Facility, Maximum Borrowing Capacity                           $ 4,500
Senior Subordinated Notes [Member]                            
Debt Instrument [Line Items]                            
Long-term Transition Bond                         $ 1,250  
Debt Instrument, Interest Rate, Stated Percentage                         6.00%  
4.625% Notes due 2020 [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 474      
Debt Instrument, Interest Rate, Stated Percentage                     4.625%      
3.625% Notes due 2021 [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 296      
Debt Instrument, Interest Rate, Stated Percentage                     3.625%      
4.250% Notes due 2021 [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 163      
Debt Instrument, Interest Rate, Stated Percentage                     4.25%      
2.800% Notes due 2023 [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 381      
Debt Instrument, Interest Rate, Stated Percentage                     2.80%      
6.500% Debentures due 2028 [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 57      
Debt Instrument, Interest Rate, Stated Percentage                     6.50%      
5.600% Senior Notes due 2036 [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 42      
Debt Instrument, Interest Rate, Stated Percentage                     5.60%      
4.900% Notes due 2041 [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 48      
Debt Instrument, Interest Rate, Stated Percentage                     4.90%      
4.150% Notes due 2043 [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Gross                     $ 69      
Debt Instrument, Interest Rate, Stated Percentage                     4.15%      
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        
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        
Tender Notes [Member] | Loans Payable [Member]                            
Debt Instrument [Line Items]                            
Tender Offer for Debt Securities                       $ 6,200    
Extinguishment of Debt, Amount   $ 4,409                        
Repayments of Long-term Debt, including breakage fees and all applicable accrued and unpaid interest   4,849                        
Loss on Extinguishment of Debt   $ 81                        
EID [Member] | Term Loan Facility due 2020 [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity                           $ 4,500