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Debt and Letters of Credit - Narrative (Details)
1 Months Ended 12 Months Ended
Feb. 22, 2022
USD ($)
Aug. 31, 2018
USD ($)
Mar. 31, 2016
EUR (€)
Nov. 30, 2014
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                
Borrowings under credit facility         $ 0     $ 0
2028 Notes                
Debt Instrument [Line Items]                
Debt instrument, face amount   $ 600,000,000            
Interest rate   4.25%            
Proceeds from issuance of notes, net of underwriting discounts   $ 595,000,000            
2028 Notes | Prior to June 15, 2028                
Debt Instrument [Line Items]                
Redemption price (as a percent)         100.00%      
2023 Notes                
Debt Instrument [Line Items]                
Debt instrument, face amount | €     € 500,000,000          
Interest rate     1.75%          
Proceeds from issuance of notes, net of underwriting discounts | €     € 497,000,000          
2023 Notes | Minimum | Prior to December 21, 2022                
Debt Instrument [Line Items]                
Redemption price (as a percent)         100.00%      
2024 Notes                
Debt Instrument [Line Items]                
Debt instrument, face amount       $ 500,000,000        
Interest rate       3.50%        
Proceeds from issuance of notes, net of underwriting discounts       $ 491,000,000        
2024 Notes | Minimum | Prior to September 15, 2024                
Debt Instrument [Line Items]                
Redemption price (as a percent)         100.00%      
Senior Notes Due 2018, 2016 and 2014                
Debt Instrument [Line Items]                
Redemption price (as a percent)         101.00%      
Senior Notes 1.750%, Due 2023                
Debt Instrument [Line Items]                
Debt instrument, face amount             $ 375,000,000  
Senior Notes 3.50 Percent, Due 2024                
Debt Instrument [Line Items]                
Debt instrument, face amount             $ 108,000,000  
Senior Notes 1.750 Percent, Due 2023 and Senior Notes 3.50 Percent, Due 2024                
Debt Instrument [Line Items]                
Repayments of debt         $ 26,000,000      
Senior Notes 1.750 Percent, Due 2023 and Senior Notes 3.50 Percent, Due 2024 | Corporate general and administrative expense                
Debt Instrument [Line Items]                
Gain (loss) on extinguishment of debt         20,000,000      
Lines of credit | Committed lines of credit                
Debt Instrument [Line Items]                
Letters of credit outstanding         429,000,000      
Remaining borrowing capacity of credit facility         779,000,000      
Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility | Subsequent Event                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 1,800,000,000              
Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility | Minimum                
Debt Instrument [Line Items]                
Credit facility         $ 1,650,000,000      
Debt-to-capitalization ratio (cannot exceed)         65.00%      
Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility | Minimum | Subsequent Event                
Debt Instrument [Line Items]                
Debt-to-capitalization ratio (cannot exceed) 60.00%              
Lines of credit | Uncommitted Credit Line                
Debt Instrument [Line Items]                
Credit facility         $ 896,000,000      
Borrowings under credit facility         0      
Subsidiaries | Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility                
Debt Instrument [Line Items]                
Covenant, minimum liquidity after repayments of debt         1,250,000,000      
Subsidiaries | Lines of credit | Committed lines of credit | Revolving Loan and Letter of Credit Facility | Maximum                
Debt Instrument [Line Items]                
Cap on aggregate amount of debt (greater of)         $ 750,000,000 € 750,000,000