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Borrowings and Credit Arrangements - Long-Term Borrowings (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 15, 2019
Mar. 09, 2018
Aug. 31, 2019
Jul. 31, 2019
May 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Nov. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 28, 2018
Dec. 15, 2017
Debt Instrument [Line Items]                          
Proceeds from debt $ 3,500,000,000                        
Proceeds from derivative instruments       $ 25,000,000         $ 25,000,000 $ (446,000,000) $ 0    
Loss on net cash flow hedges       18,000,000                  
Premium paid in excess of debt principal     $ 76,000,000                    
Debt extinguishment fees     8,000,000                    
Gain on write off of unamortized deferred financing premiums     5,000,000                    
Loss on early extinguishment of debt     $ 79,000,000           79,000,000 0 $ 0    
Proceeds from hedge transaction   $ 446,000,000                      
Gain on hedge transaction   331,000,000                      
Amount outstanding                 $ 68,438,000,000        
2018 Senior Notes                          
Debt Instrument [Line Items]                          
Debt face amount   40,000,000,000                      
Proceeds from debt   39,400,000,000                      
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%               2.265%        
Amount outstanding             $ 0   $ 1,000,000,000 0      
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%        
Amount outstanding             0   $ 1,750,000,000 0      
Senior Notes | 2018 Senior Notes                          
Debt Instrument [Line Items]                          
Debt face amount   40,000,000,000.0                      
Senior Notes | 3.125% senior notes due March 2020                          
Debt Instrument [Line Items]                          
Debt face amount   2,000,000,000                      
Debt interest rate     3.125%           3.125%        
Aggregate principal of debt extinguished     $ 1,300,000,000                    
Amount outstanding             2,000,000,000   $ 723,000,000 2,000,000,000      
Senior Notes | 3.35% senior notes due March 2021                          
Debt Instrument [Line Items]                          
Debt face amount   3,000,000,000                      
Debt interest rate     3.35%           3.35%        
Aggregate principal of debt extinguished     $ 962,000,000                    
Amount outstanding             3,000,000,000   $ 2,038,000,000 3,000,000,000      
Senior Notes | Floating rate notes due March 2021                          
Debt Instrument [Line Items]                          
Debt face amount   1,000,000,000                      
Senior Notes | 3.7% senior notes due March 2023                          
Debt Instrument [Line Items]                          
Debt face amount   6,000,000,000                      
Debt interest rate                 3.70%        
Amount outstanding             6,000,000,000   $ 6,000,000,000 6,000,000,000      
Senior Notes | 4.1% senior notes due March 2025                          
Debt Instrument [Line Items]                          
Debt face amount   5,000,000,000                      
Debt interest rate                 4.10%        
Amount outstanding             5,000,000,000   $ 5,000,000,000 5,000,000,000      
Senior Notes | 4.3% senior notes due March 2028                          
Debt Instrument [Line Items]                          
Debt face amount   9,000,000,000                      
Debt interest rate                 4.30%        
Amount outstanding             9,000,000,000   $ 9,000,000,000 9,000,000,000      
Senior Notes | 4.78% senior notes due March 2038                          
Debt Instrument [Line Items]                          
Debt face amount   5,000,000,000                      
Debt interest rate                 4.78%        
Amount outstanding             5,000,000,000   $ 5,000,000,000 5,000,000,000      
Senior Notes | 5.05% senior notes due March 2048                          
Debt Instrument [Line Items]                          
Debt face amount   8,000,000,000                      
Debt interest rate                 5.05%        
Amount outstanding             8,000,000,000   $ 8,000,000,000 8,000,000,000      
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%        
Amount outstanding             0   $ 750,000,000 0      
Senior Notes | Outstanding Senior Notes                          
Debt Instrument [Line Items]                          
Aggregate principal of debt extinguished     $ 4,000,000,000.0                    
Senior Notes | 4.125% senior notes due 2021                          
Debt Instrument [Line Items]                          
Debt interest rate     4.125%                    
Aggregate principal of debt extinguished     $ 328,000,000                    
Senior Notes | 4.125% senior notes issued by Aetna due 2021                          
Debt Instrument [Line Items]                          
Debt interest rate     4.125%                    
Aggregate principal of debt extinguished     $ 297,000,000                    
Senior Notes | 5.45% senior notes due June 2021                          
Debt Instrument [Line Items]                          
Debt interest rate     5.45%           5.45%        
Aggregate principal of debt extinguished     $ 413,000,000                    
Amount outstanding             $ 600,000,000   $ 187,000,000 $ 600,000,000      
Notes Payable | Floating rate notes due March 2020                          
Debt Instrument [Line Items]                          
Debt face amount   $ 1,000,000,000                      
Debt interest rate             3.397%   2.515% 3.397%      
Aggregate principal of debt extinguished     $ 723,000,000                    
Amount outstanding             $ 1,000,000,000   $ 277,000,000 $ 1,000,000,000      
Notes Payable | Floating rate notes due March 2021                          
Debt Instrument [Line Items]                          
Debt interest rate             3.487%   2.605% 3.487%      
Amount outstanding             $ 1,000,000,000   $ 1,000,000,000 $ 1,000,000,000      
Notes Payable | 3-Year and 5-Year Term Loan                          
Debt Instrument [Line Items]                          
Debt face amount                       $ 5,000,000,000.0  
Maximum borrowing capacity                         $ 5,000,000,000.0
Notes Payable | 3-year tranche term loan due November 2021                          
Debt Instrument [Line Items]                          
Debt face amount                       3,000,000,000.0  
Debt instrument term               3 years   3 years      
Repayment of debt       $ 1,500,000,000 $ 1,000,000,000.0 $ 500,000,000              
Amount outstanding             3,000,000,000   $ 0 $ 3,000,000,000      
Notes Payable | 5-Year tranche loan due November 2023                          
Debt Instrument [Line Items]                          
Debt face amount                       2,000,000,000.0  
Debt instrument term               5 years          
Repayment of debt             $ 2,000,000,000.0            
Aetna Inc.                          
Debt Instrument [Line Items]                          
Assumed debt                       $ 8,098,000,000  
Minimum | Aetna Inc.                          
Debt Instrument [Line Items]                          
Debt interest rate                       2.20%  
Maximum | Aetna Inc.                          
Debt Instrument [Line Items]                          
Debt interest rate                       6.75%