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Borrowings and Credit Arrangements - Long-Term Borrowings (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 18, 2021
Dec. 16, 2020
Aug. 21, 2020
Dec. 31, 2021
Aug. 31, 2021
Dec. 31, 2020
Aug. 31, 2020
Aug. 31, 2019
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]                        
Proceeds from debt $ 987,000,000   $ 3,970,000,000                  
Proceeds from derivative instruments                 $ 7,000,000 $ 0 $ 7,000,000 $ 25,000,000
Loss on net cash flow hedges                 5,000,000      
Premium paid in excess of debt principal       $ 80,000,000 $ 332,000,000 $ 619,000,000 $ 706,000,000 $ 76,000,000        
Write off of deferred debt issuance cost       8,000,000 26,000,000 45,000,000 47,000,000          
Debt extinguishment fees       1,000,000 5,000,000 10,000,000 13,000,000 8,000,000        
Loss on early extinguishment of debt       89,000,000 $ 363,000,000 674,000,000 766,000,000 79,000,000   452,000,000 1,440,000,000 $ 79,000,000
Amount outstanding       $ 55,443,000,000           $ 55,443,000,000    
Net gain on write-off of net unamortized deferred financing premiums on early extinguishment of debt               5,000,000        
Senior Notes | 2.125% senior notes due September 2031                        
Debt Instrument [Line Items]                        
Debt face amount $ 1,000,000,000                      
Debt interest rate 2.125%     2.125%           2.125%    
Amount outstanding       $ 1,000,000,000   0       $ 1,000,000,000 0  
Senior Notes | 1.3% senior notes due August 2027                        
Debt Instrument [Line Items]                        
Debt face amount   $ 750,000,000 $ 1,500,000,000                  
Debt interest rate   1.30% 1.30%                  
Senior Notes | 1.875%, senior notes due February 2031                        
Debt Instrument [Line Items]                        
Debt face amount   $ 1,250,000,000                    
Debt interest rate   1.875%                    
Proceeds from debt   $ 1,990,000,000                    
Senior Notes | 1.75% senior notes due August 2030                        
Debt Instrument [Line Items]                        
Debt face amount     $ 1,250,000,000                  
Debt interest rate     1.75%                  
Senior Notes | 2.7% senior notes due August 2040                        
Debt Instrument [Line Items]                        
Debt face amount     $ 1,250,000,000                  
Debt interest rate     2.70%                  
Senior Notes | 3.625% senior notes due April 2027                        
Debt Instrument [Line Items]                        
Debt face amount                 $ 750,000,000      
Debt interest rate                 3.625%      
Senior Notes | 3.75% senior notes due April 2030                        
Debt Instrument [Line Items]                        
Debt face amount                 $ 1,500,000,000      
Debt interest rate                 3.75%      
Senior Notes | 4.125% senior notes due April 2040                        
Debt Instrument [Line Items]                        
Debt face amount                 $ 1,000,000,000      
Debt interest rate                 4.125%      
Senior Notes | 4.25% senior notes due April 2050                        
Debt Instrument [Line Items]                        
Debt face amount                 $ 750,000,000      
Debt interest rate                 4.25%      
Proceeds from debt                 $ 3,950,000,000      
Senior Notes | 2.625% senior notes due August 2024                        
Debt Instrument [Line Items]                        
Debt interest rate       2.625%           2.625%    
Amount outstanding       $ 1,000,000,000   1,000,000,000       $ 1,000,000,000 1,000,000,000  
Senior Notes | 3% senior notes due August 2026                        
Debt Instrument [Line Items]                        
Debt interest rate       3.00%           3.00%    
Amount outstanding       $ 750,000,000   750,000,000       $ 750,000,000 750,000,000  
Senior Notes | 3.25% senior notes due August 2029                        
Debt Instrument [Line Items]                        
Debt interest rate       3.25%           3.25%    
Amount outstanding       $ 1,750,000,000   1,750,000,000       $ 1,750,000,000 $ 1,750,000,000  
Senior Notes | Senior Notes, 4.3%, Due 2028                        
Debt Instrument [Line Items]                        
Debt interest rate         4.30%              
Aggregate principal of debt extinguished         $ 2,000,000,000              
Senior Notes | Outstanding Senior Notes                        
Debt Instrument [Line Items]                        
Aggregate principal of debt extinguished           $ 4,500,000,000 $ 6,000,000,000 $ 4,000,000,000        
Senior Notes | 4% senior notes due December 2023                        
Debt Instrument [Line Items]                        
Debt interest rate       4.00%   4.00% 4.00%     4.00% 4.00%  
Aggregate principal of debt extinguished           $ 113,000,000 $ 723,000,000          
Amount outstanding       $ 414,000,000   $ 414,000,000       $ 414,000,000 $ 414,000,000  
Senior Notes | 3.7% senior notes due March 2023                        
Debt Instrument [Line Items]                        
Debt interest rate       3.70%   3.70% 3.70%     3.70% 3.70%  
Aggregate principal of debt extinguished           $ 1,400,000,000 $ 2,300,000,000          
Amount outstanding       $ 0   $ 2,336,000,000       $ 0 $ 2,336,000,000  
Senior Notes | 4.1% senior notes due March 2025                        
Debt Instrument [Line Items]                        
Debt interest rate       4.10%   4.10% 4.10%     4.10% 4.10%  
Aggregate principal of debt extinguished           $ 1,000,000,000 $ 3,000,000,000          
Amount outstanding       $ 950,000,000   $ 950,000,000       $ 950,000,000 $ 950,000,000  
Senior Notes | 4.3% senior notes due 2028                        
Debt Instrument [Line Items]                        
Debt interest rate           4.30%         4.30%  
Aggregate principal of debt extinguished           $ 2,000,000,000            
Senior Notes | 4.125% senior notes due May 2021                        
Debt Instrument [Line Items]                        
Debt interest rate       4.125%       4.125%   4.125%    
Aggregate principal of debt extinguished               $ 328,000,000        
Amount outstanding       $ 0   222,000,000       $ 0 $ 222,000,000  
Senior Notes | 4.125% senior notes due June 2021                        
Debt Instrument [Line Items]                        
Debt interest rate       4.125%       4.125%   4.125%    
Aggregate principal of debt extinguished               $ 297,000,000        
Amount outstanding       $ 0   203,000,000       $ 0 203,000,000  
Senior Notes | 5.45% senior notes due June 2021                        
Debt Instrument [Line Items]                        
Debt interest rate       5.45%       5.45%   5.45%    
Aggregate principal of debt extinguished               $ 413,000,000        
Amount outstanding       $ 0   187,000,000       $ 0 187,000,000  
Senior Notes | 3.35% senior notes due March 2021                        
Debt Instrument [Line Items]                        
Debt interest rate       3.35%       3.35%   3.35%    
Aggregate principal of debt extinguished               $ 962,000,000        
Amount outstanding       $ 0   $ 2,038,000,000       $ 0 $ 2,038,000,000  
Senior Notes | Senior Notes, 3 Point 70 Percent, Due 2023                        
Debt Instrument [Line Items]                        
Debt interest rate       3.70%           3.70%    
Aggregate principal of debt extinguished       $ 2,300,000,000                
Senior Notes | 3.125% senior notes due March 2020                        
Debt Instrument [Line Items]                        
Debt interest rate               3.125%        
Aggregate principal of debt extinguished               $ 1,300,000,000        
Floating Rate Notes | Floating rate notes due March 2020                        
Debt Instrument [Line Items]                        
Aggregate principal of debt extinguished               $ 723,000,000