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Long-Term Debt and Revolving Credit Arrangements - Narrative (Details)
1 Months Ended
Aug. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
day
$ / shares
Rate
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Feb. 25, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                    
Decrease to additional paid-in capital   $ 12,967,000,000 $ 14,056,000,000 $ 14,175,000,000 $ 13,598,000,000   $ 9,633,000,000 $ 10,239,000,000 $ 12,028,000,000 $ 14,872,000,000
Cumulative Effect, Period of Adoption, Adjustment                    
Debt Instrument [Line Items]                    
Decrease to additional paid-in capital   (243,000,000)                
Additional Paid-In Capital                    
Debt Instrument [Line Items]                    
Decrease to additional paid-in capital   35,931,000,000 37,281,000,000 $ 35,588,000,000 $ 36,182,000,000   $ 31,549,000,000 $ 31,267,000,000 $ 31,035,000,000 $ 30,739,000,000
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment                    
Debt Instrument [Line Items]                    
Decrease to additional paid-in capital   (243,000,000)                
Secured Loans | Refinanced Term Loans                    
Debt Instrument [Line Items]                    
Aggregate principal amount           $ 2,600,000,000        
Secured Loans | 2027 Refinanced Term Loan                    
Debt Instrument [Line Items]                    
Aggregate principal amount           1,100,000,000        
Secured Loans | 2027 Refinanced Term Loan | Level 2                    
Debt Instrument [Line Items]                    
Fair Value of long-term debt     1,100,000,000              
Secured Loans | 2025 Refinanced Term Loan                    
Debt Instrument [Line Items]                    
Aggregate principal amount           $ 1,500,000,000        
Secured Loans | 2025 Refinanced Term Loan | Level 2                    
Debt Instrument [Line Items]                    
Fair Value of long-term debt     1,500,000,000              
Convertible Notes | 2025 Convertible Note                    
Debt Instrument [Line Items]                    
Aggregate principal amount   1,150,000,000                
Additional principal amount   $ 150,000,000                
Stated interest rate   0.00%                
Conversion ratio | Rate   1.23701%                
Conversion price (in dollars per share) | $ / shares   $ 80.84                
Redemption price (in percent)   1.00%                
Interest costs capitalized   $ 243,000,000                
Convertible Notes | 2025 Convertible Note | Debt Conversion Terms One                    
Debt Instrument [Line Items]                    
Threshold trading days | day   20                
Threshold consecutive trading days | day   30                
Threshold percentage of stock price trigger   1.30%                
Convertible Notes | 2025 Convertible Note | Debt Conversion Terms Two                    
Debt Instrument [Line Items]                    
Threshold trading days | day   5                
Threshold consecutive trading days | day   10                
Threshold percentage of stock price trigger   0.98%                
Convertible Notes | 2025 Convertible Note | Level 2                    
Debt Instrument [Line Items]                    
Fair Value of long-term debt     1,100,000,000              
Line of Credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Borrowing capacity     2,300,000,000              
Line of credit balance     0              
Line of Credit | Letters of Credit                    
Debt Instrument [Line Items]                    
Letters of credit outstanding   $ 649,000,000 763,000,000              
Letters of credit outstanding that will reduce the available credit under facilities   $ 233,000,000 263,000,000              
Senior Note | Level 2                    
Debt Instrument [Line Items]                    
Fair Value of long-term debt     6,037,000,000              
Senior Note | 2029 Senior Note                    
Debt Instrument [Line Items]                    
Aggregate principal amount $ 1,500,000,000                  
Stated interest rate 4.50%                  
Redemption price (in percent) 1.00%                  
Debt instrument term (in years) 8 years                  
Debt issuance cost $ 16,000,000                  
Senior Note | 2029 Senior Note | Level 2                    
Debt Instrument [Line Items]                    
Fair Value of long-term debt     1,511,000,000              
Senior Note | 2027 Senior Note | Level 2                    
Debt Instrument [Line Items]                    
Fair Value of long-term debt     $ 1,323,000,000