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Long-Term Debt and Available Credit Facilities Debt Redemptions/Repayments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended 37 Months Ended
May 02, 2019
Dec. 11, 2018
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
[1]
Dec. 31, 2018
[1]
Nov. 13, 2021
Mar. 31, 2019
Mar. 31, 2020
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) $ 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                        
Revolving Credit Facilities due 2022 [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Term             3 years              
Line of Credit Facility, Maximum Borrowing Capacity       $ 3,000               $ 3,000    
Long-term Line of Credit                 $ 500          
EID [Member] | Term Loan Facility due 2020 [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity                           $ 4,500
[1] The cash flows for the years ended December 31, 2018 and 2019 includes cash flows of EID's ECP and Specialty Products Entities.