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Borrowings (Details)
€ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
borrowing
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
May 30, 2020
USD ($)
Apr. 30, 2020
Aug. 31, 2019
USD ($)
Jun. 30, 2021
USD ($)
instrument
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2021
EUR (€)
Feb. 28, 2021
USD ($)
Apr. 14, 2020
USD ($)
Debt Instrument [Line Items]                            
Aggregate principal amount   $ 700,000,000   $ 300,000,000                   $ 1,500,000,000
Stated interest percentage   1.20%   2.55%                    
Redemption price, percentage   101.00%   101.00%                    
Proceeds from issuance of notes   $ 692,000,000   $ 296,000,000                    
Debt instrument term         364 days                  
Repayment of term loan                 $ 400,000,000 $ 0 $ 1,100,000,000      
Proceeds from revolving credit facility                 $ 0 800,000,000        
Debt covenant, acquisition for consideration, minimum threshold $ 1,000,000,000                          
Debt covenant, total indebtedness to total capitalization ratio, maximum when acquisition for consideration threshold is met, percentage 0.65                          
Debt instrument, total indebtedness to total capitalization, percentage                 0.50          
Long-term commercial paper $ 800,000,000           $ 800,000,000   $ 800,000,000   250,000,000      
Long-term Debt $ 7,091,000,000           7,091,000,000   7,091,000,000   5,334,000,000      
Repayments of Debt             $ 170,000,000   $ 172,000,000 506,000,000        
Debt Instrument, Number Of Debt Instruments Matured | instrument             2              
Debt covenant, total indebtedness to total capitalization ratio, maximum 0.60           0.60   0.60     0.60    
Debt extinguishment charge             $ 0 $ (7,000,000) $ 0 $ (7,000,000)        
Term Loan Credit Agreement                            
Debt Instrument [Line Items]                            
Aggregate principal amount                         $ 2,000,000,000.0  
Maximum borrowing capacity                         $ 2,000,000,000.0  
Proceeds from revolving credit facility $ 700,000,000                          
Debt Instrument, Maximum Number Of Additional Borrowings | borrowing 11                          
Non - Callable Debentures 9 Percent Due 2021                            
Debt Instrument [Line Items]                            
Stated interest percentage 9.00%           9.00%   9.00%     9.00%    
Long-term Debt $ 134,000,000           $ 134,000,000   $ 134,000,000          
Other Non US Debt                            
Debt Instrument [Line Items]                            
Long-term Debt | €                       € 30    
Notes Payable, Other Payables                            
Debt Instrument [Line Items]                            
Stated interest percentage     3.60%         3.60%   3.60%        
Early redemption of notes     $ 500,000,000                      
Debt extinguishment charge     7,000,000                      
Unamortized fees and discounts related to the debt redeemed     1,000,000                      
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost     $ 6,000,000                      
Revolving Credit Facility | Unsecured Debt                            
Debt Instrument [Line Items]                            
Debt instrument term           5 years                
Revolving credit facility outstanding           $ 2,200,000,000                
Line of credit facility, additional borrowing capacity available to lender conditions           $ 750,000,000                
Proceeds from revolving credit facility             800,000,000              
Long-term Debt $ 0           $ 0   $ 0   $ 0