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Long-Term Debt and Revolving Credit Arrangements - Fair Value of Senior Notes (Details) - Level 2 - Senior Note
$ in Millions
Sep. 30, 2021
USD ($)
Debt Instrument [Line Items]  
Fair Value of long-term debt $ 6,037
2025 Senior Note  
Debt Instrument [Line Items]  
Fair Value of long-term debt 1,067
2026 Senior Note  
Debt Instrument [Line Items]  
Fair Value of long-term debt 1,598
2027 Senior Note  
Debt Instrument [Line Items]  
Fair Value of long-term debt 1,323
2028 Senior Note  
Debt Instrument [Line Items]  
Fair Value of long-term debt 538
2029 Senior Note  
Debt Instrument [Line Items]  
Fair Value of long-term debt $ 1,511