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Debt (Tables)

12 Months Ended

Dec. 31, 2021

Debt

Components of Debt

The following table summarizes the major components of debt as of each balance sheet date (in millions) and provides the maturities and interest rate ranges of each major category as of December 31:

​	​	​	​	​	​	​
​		2021			2020
Commercial paper program (weighted average interest rate of 0.4% as of December 31, 2021 and December 31, 2020)	​	$	1,778	​	$	1,814
Senior notes, maturing through 2050, interest rates ranging from 0.75% to 7.75% (weighted average interest rate of 3.1% as of December 31, 2021 and 3.3% as of December 31, 2020)	​		8,126	​		8,465
Canadian senior notes, C$500 million maturing September 2026, interest rate of 2.6%	​	​	395	​	​	393
Tax-exempt bonds, maturing through 2048, fixed and variable interest rates ranging from 0.1% to 4.3% (weighted average interest rate of 1.4% as of December 31, 2021 and 1.7% as of December 31, 2020)	​		2,619	​		2,571
Financing leases and other, maturing through 2085, weighted average interest rate of 4.5% as of December 31, 2021 and 4.6% as of December 31, 2020) (a)	​		567	​		652
Debt issuance costs, discounts and other	​		(80)	​		(85)
​	​		13,405	​		13,810
Current portion of long-term debt	​		708	​		551
​	​	$	12,697	​	$	13,259

(a) Excluding our landfill financing leases, the maturities of our financing leases and other debt obligations extend through 2059.

Summary of debt redeemed

​

​	​	​	​	​	​	​
​	​	Principal		​	​	​
​	​	Outstanding		​	Notes Tendered
Description	​	Prior to Tender		​	and Redeemed
6.125% WMI senior notes due 2039	​	$	252	​	$	6
7.75% WMI senior notes due 2032	​	​	153	​	​	9
7.375% WMI senior notes due 2029	​	​	81	​	​	—
4.15% WMI senior notes due 2049	​	​	1,000	​	​	316
4.10% WMI senior notes due 2045	​	​	750	​	​	334
3.90% WMI senior notes due 2035	​	​	450	​	​	153
7.00% WMI senior notes due 2028	​	​	330	​	​	73
7.10% WM Holdings senior notes due 2026	​	​	249	​	​	26
3.50% WMI senior notes due 2024	​	​	350	​	​	194
3.125% WMI senior notes due 2025	​	​	600	​	​	178
3.15% WMI senior notes due 2027	​	​	750	​	​	—
2.90% WMI senior notes due 2022	​		500	​	​	—
2.40% WMI senior notes due 2023	​		500	​	​	—
Total	​	$	5,965	​	​	1,289

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Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

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Tabular disclosure of debt extinguished which may include, amount of gain (loss), the income tax effect and the per share amount of the aggregate gain (loss), net of the related income tax.

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