Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Borrowing Arrangements (Schedule of Available Capacity Under Borrowing Arrangements) (Details)

v3.21.1
Long-Term Debt and Borrowing Arrangements (Schedule of Available Capacity Under Borrowing Arrangements) (Details) - $750 million revolving credit facility (due May 2023) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total capacity $ 750  
Less: Letters of credit 15  
Available capacity 735  
Line of Credit    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 0