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Borrowings - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 21, 2020
Mar. 31, 2020
Aug. 31, 2020
Mar. 31, 2020
Aug. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]                    
Proceeds from debt $ 3,970,000,000 $ 3,950,000,000                
Derivative settlements       $ 7,000,000       $ 7,000,000 $ 25,000,000  
Loss on net cash flow hedges       5,000,000            
Premium paid in excess of debt principal     $ 706,000,000   $ 76,000,000          
Debt extinguishment fees     13,000,000   8,000,000          
Write off of deferred debt issuance cost     47,000,000   5,000,000          
Loss on early extinguishment of debt     766,000,000   79,000,000 $ 766,000,000 $ 79,000,000 $ 766,000,000 $ 79,000,000  
Senior Notes | 1.3% senior notes due August 2027                    
Debt Instrument [Line Items]                    
Face amount of debt $ 1,500,000,000                  
Debt interest rate 1.30%         1.30%   1.30%    
Senior Notes | 1.75% senior notes due August 2030                    
Debt Instrument [Line Items]                    
Face amount of debt $ 1,250,000,000                  
Debt interest rate 1.75%         1.75%   1.75%    
Senior Notes | 2.7% senior notes due August 2040                    
Debt Instrument [Line Items]                    
Face amount of debt $ 1,250,000,000                  
Debt interest rate 2.70%         2.70%   2.70%    
Senior Notes | 3.625% senior notes due April 2027                    
Debt Instrument [Line Items]                    
Face amount of debt   $ 750,000,000   $ 750,000,000            
Debt interest rate   3.625%   3.625%   3.625%   3.625%    
Senior Notes | 3.75% senior notes due April 2030                    
Debt Instrument [Line Items]                    
Face amount of debt   $ 1,500,000,000   $ 1,500,000,000            
Debt interest rate   3.75%   3.75%   3.75%   3.75%    
Senior Notes | 4.125% senior notes due April 2040                    
Debt Instrument [Line Items]                    
Face amount of debt   $ 1,000,000,000.0   $ 1,000,000,000.0            
Debt interest rate   4.125%   4.125%   4.125%   4.125%    
Senior Notes | 4.25% senior notes due April 2050                    
Debt Instrument [Line Items]                    
Face amount of debt   $ 750,000,000   $ 750,000,000            
Debt interest rate   4.25%   4.25%   4.25%   4.25%    
Senior Notes | Outstanding Senior Notes                    
Debt Instrument [Line Items]                    
Aggregate principal of debt extinguished     $ 6,000,000,000.0   $ 4,000,000,000.0          
Senior Notes | 3.125% senior notes due March 2020                    
Debt Instrument [Line Items]                    
Debt interest rate         3.125%         3.125%
Aggregate principal of debt extinguished         $ 1,300,000,000          
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          
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          
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          
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          
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     $ 2,300,000,000              
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     $ 723,000,000              
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     $ 3,000,000,000.0              
Floating Rate Notes [Member] | Floating rate notes due March 2020 (2.515% at December 31, 2019)                    
Debt Instrument [Line Items]                    
Aggregate principal of debt extinguished         $ 723,000,000