v3.20.4
Debt - Schedule of Outstanding Debt (Details) - USD ($)
Dec. 31, 2020
Sep. 28, 2020
May 01, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Total principal $ 7,650,000,000     $ 7,400,000,000
Unamortized discounts, premiums and debt issuance costs (41,000,000)     (35,000,000)
Total debt, including unamortized discounts, premiums, debt issuance costs and fair value adjustments 7,609,000,000     7,365,000,000
Current portion of long-term debt 0     0
Long-term debt 7,609,000,000     7,365,000,000
Unsecured Debt | Fixed-rate 4.125% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 0     $ 1,350,000,000
Effective rate 4.125%     4.125%
Range of interest rates   4.125%    
Unsecured Debt | Fixed-rate 4.625% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 0     $ 400,000,000
Effective rate 4.625%     4.625%
Range of interest rates   4.625%    
Unsecured Debt | Fixed-rate 3.875% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 1,000,000,000     $ 1,000,000,000
Effective rate 3.875%     3.875%
Unsecured Debt | Fixed-rate 4.625% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 900,000,000     $ 900,000,000
Effective rate 4.625%     4.625%
Unsecured Debt | Fixed-rate 4.875% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 1,000,000,000     $ 1,000,000,000
Effective rate 4.875%     4.875%
Unsecured Debt | Fixed-rate 2.7% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 500,000,000   $ 500,000,000 $ 0
Effective rate 2.70%     0.00%
Range of interest rates     2.70%  
Unsecured Debt | Fixed-rate 5.35% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 500,000,000     $ 500,000,000
Effective rate 5.35%     5.35%
Unsecured Debt | Fixed-rate 3.875% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 750,000,000     $ 750,000,000
Effective rate 3.875%     3.875%
Unsecured Debt | Fixed-rate 3.15% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 500,000,000   $ 500,000,000 $ 0
Effective rate 3.15%     0.00%
Range of interest rates     3.15%  
Unsecured Debt | Fixed-rate 5.55% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 500,000,000     $ 500,000,000
Effective rate 5.55%     5.55%
Unsecured Debt | Fixed-rate 4.3% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 1,000,000,000     $ 1,000,000,000
Effective rate 4.30%     4.30%
Unsecured Debt | Fixed-rate 3.4% senior unsecured notes        
Debt Instrument [Line Items]        
Total principal $ 1,000,000,000   $ 1,000,000,000 $ 0
Effective rate 3.40%     0.00%
Range of interest rates     3.40%  
Revolving Credit Facility | Floating-rate revolving credit facility (RCF)        
Debt Instrument [Line Items]        
Total principal $ 0     $ 0
Effective rate 0.00%     0.00%