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Debt
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Debt Debt
 
Debt maturities are presented below:
 December 31,
 20212020
 ($ in millions)
Notes and debentures, with weighted-average interest rates as of December 31, 2021:  
3.40% maturing to 2026
$2,699 $3,273 
4.26% maturing 2027 to 2031
2,614 2,114 
4.02% maturing 2037 to 2055
8,097 7,497 
5.22% maturing 2097 to 2121
1,384 784 
Finance leases22 25 
Discounts, premiums, and debt issuance costs(976)(1,012)
Total debt13,840 12,681 
Less current maturities(553)(579)
Long-term debt excluding current maturities$13,287 $12,102 
Long-term debt maturities subsequent to 2022 are as follows: 
2023$603 
2024403 
2025554 
2026602 
2027 and subsequent years11,125 
  
Total$13,287 

In August 2021, we issued $600 million of 2.90% senior notes due 2051, resulting in $589 million in net proceeds.

In May 2021, we issued $500 million of 2.30% senior notes due 2031, resulting in $495 million in net proceeds and $600 million of 4.10% senior notes due 2121, resulting in $592 million in net proceeds. The net proceeds of the 2.30% senior notes due 2031 will be used to finance or refinance, in whole or in part, new or existing eligible projects with environmental benefits as outlined in our Green Financing Framework.

In May 2021, we renewed, amended and restated our accounts receivable securitization program with a maximum borrowing capacity of $400 million. The term expires in May 2022. We had no amounts outstanding under this program and our available borrowing capacity was $400 million at both December 31, 2021 and December 31, 2020.

Credit Agreement and Debt Covenants

We also have in place and available an $800 million credit agreement expiring in March 2025, which provides for borrowings at prevailing rates and includes covenants. We had no amounts outstanding under this facility at either December 31, 2021 or December 31, 2020, and we are in compliance with all of its covenants.