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Debt (Narrative) (Long-Term Debt) (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2011
Jan. 30, 2021
Debt Instrument [Line Items]      
2022     $ 0
2023     0
2024     0
2025     0
2026     0
Notes due 2021 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount     $ 650,000,000
Interest rate     5.50%
Debt Issuance Costs, Gross   $ 4,000,000  
Proceeds from Debt, Net of Issuance Costs   $ 644,000,000  
Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount     $ 500,000,000
Interest rate     4.45%
Debt Issuance Costs, Gross $ 5,000,000    
Proceeds from Debt, Net of Issuance Costs $ 495,000,000    
Debt Instrument, Redemption Price, Percentage     100.00%
Debt Instrument, Redemption Price, Control Triggering Percentage     101.00%
Notes Due 2030 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount     $ 650,000,000
Interest rate     1.95%
Debt Instrument, Unamortized Discount     $ 8,000,000
Proceeds from Debt, Net of Issuance Costs     $ 642,000,000
Debt Instrument, Redemption Price, Percentage     100.00%
Debt Instrument, Redemption Price, Control Triggering Percentage     101.00%