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Borrowings and Credit Arrangements - Long-Term Borrowings (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 21, 2020
Aug. 15, 2019
Dec. 31, 2020
Aug. 31, 2020
Aug. 31, 2019
Jul. 31, 2019
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 16, 2020
Nov. 28, 2018
Debt Instrument [Line Items]                        
Proceeds from debt $ 3,970,000,000 $ 3,460,000,000         $ 3,950,000,000 $ 1,990,000,000        
Proceeds from derivative instruments           $ 25,000,000 7,000,000 7,000,000 $ 25,000,000 $ (446,000,000)    
Loss on net cash flow hedges           $ 18,000,000 5,000,000          
Premium paid in excess of debt principal     $ 619,000,000 $ 706,000,000 $ 76,000,000              
Gain on write off of unamortized deferred financing premiums     (45,000,000) (47,000,000) (5,000,000)              
Debt extinguishment fees     10,000,000 13,000,000 8,000,000              
Loss on early extinguishment of debt     674,000,000 766,000,000 79,000,000     1,440,000,000 79,000,000 $ 0    
Amount outstanding     64,235,000,000         64,235,000,000        
Senior Notes | 1.3% senior notes due August 2027                        
Debt Instrument [Line Items]                        
Debt face amount 1,500,000,000   $ 750,000,000         $ 750,000,000     $ 750,000,000  
Debt interest rate     1.30%         1.30%     1.30%  
Senior Notes | 1.875%, senior notes due February 2031                        
Debt Instrument [Line Items]                        
Debt face amount     $ 1,250,000,000         $ 1,250,000,000        
Debt interest rate     1.875%         1.875%        
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             $ 1,000,000,000.0          
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%          
Senior Notes | 2.625% senior notes due August 2024                        
Debt Instrument [Line Items]                        
Debt face amount   $ 1,000,000,000.0                    
Debt interest rate   2.625% 2.625%         2.625%        
Amount outstanding     $ 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 face amount   $ 750,000,000                    
Debt interest rate   3.00% 3.00%         3.00%        
Amount outstanding     $ 750,000,000         $ 750,000,000 750,000,000      
Senior Notes | 3.25% senior notes due August 2029                        
Debt Instrument [Line Items]                        
Debt face amount   $ 1,750,000,000                    
Debt interest rate   3.25% 3.25%         3.25%        
Amount outstanding     $ 1,750,000,000         $ 1,750,000,000 1,750,000,000      
Senior Notes | Outstanding Senior Notes                        
Debt Instrument [Line Items]                        
Aggregate principal of debt extinguished     $ 4,500,000,000 $ 6,000,000,000.0 $ 4,000,000,000.0              
Senior Notes | 4% senior notes due December 2023                        
Debt Instrument [Line Items]                        
Debt interest rate     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 1,250,000,000      
Senior Notes | 3.7% senior notes due March 2023                        
Debt Instrument [Line Items]                        
Debt interest rate     3.70% 3.70%       3.70%        
Aggregate principal of debt extinguished     $ 1,400,000,000 $ 2,300,000,000                
Amount outstanding     $ 2,336,000,000         $ 2,336,000,000 6,000,000,000      
Senior Notes | 4.1% senior notes due March 2025                        
Debt Instrument [Line Items]                        
Debt interest rate     4.10% 4.10%       4.10%        
Aggregate principal of debt extinguished     $ 1,000,000,000.0 $ 3,000,000,000.0                
Amount outstanding     $ 950,000,000         $ 950,000,000 5,000,000,000      
Senior Notes | 4.3% senior notes due 2028                        
Debt Instrument [Line Items]                        
Debt interest rate     4.30%         4.30%        
Aggregate principal of debt extinguished     $ 2,000,000,000.0                  
Senior Notes | 3.125% senior notes due March 2020                        
Debt Instrument [Line Items]                        
Debt interest rate     3.125%   3.125%     3.125%        
Aggregate principal of debt extinguished         $ 1,300,000,000              
Amount outstanding     $ 0         $ 0 723,000,000      
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     $ 222,000,000         $ 222,000,000 222,000,000      
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     $ 203,000,000         $ 203,000,000 203,000,000      
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     $ 187,000,000         $ 187,000,000 187,000,000      
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     $ 2,038,000,000         $ 2,038,000,000 $ 2,038,000,000      
Notes Payable | Floating rate notes due March 2020                        
Debt Instrument [Line Items]                        
Debt interest rate                 2.515%      
Amount outstanding     $ 0         $ 0 $ 277,000,000      
Floating Rate Notes | Floating rate notes due March 2020                        
Debt Instrument [Line Items]                        
Aggregate principal of debt extinguished         $ 723,000,000              
Aetna Inc.                        
Debt Instrument [Line Items]                        
Assumed debt                       $ 8,098,000,000