Debt (Tables)

12 Months Ended

Dec. 31, 2020

Total debt as of December 31, 2020 and 2019, is summarized below:



Millions	2020		2019
Notes and debentures, 2.2% to 7.1% due through February 5, 2070	$	26,608	$	24,008
Equipment obligations, 2.6% to 6.2% due through January 2, 2031		885		923
Finance leases, 3.1% to 8.0% due through December 10, 2028		449		605
Term loans - floating rate, due October 28, 2021		250		250
Commercial paper, 0.2% to 0.3% due through January 21, 2021		75		200
Receivables securitization (Note 10)		-		400
Medium-term notes		-		8
Unamortized discount and deferred issuance costs		(1,538)		(1,194)
Total debt		26,729		25,200
Less: current portion		(1,069)		(1,257)
Total long-term debt	$	25,660	$	23,943

The following table presents aggregate debt maturities as of December 31, 2020, excluding market value adjustments:



Millions
2021	$	1,072
2022		1,384
2023		1,384
2024		1,439
2025		1,429
Thereafter		21,559
Total principal		28,267
Unamortized discount and deferred issuance costs		(1,538)
Total debt	$	26,729

During 2020, we issued the following unsecured, fixed-rate debt securities under our shelf registration:



Date	Description of Securities
January 31, 2020	$500 million of 2.150% Notes due February 5, 2027
	$750 million of 2.400% Notes due February 5, 2030
	$1.0 billion of 3.250% Notes due February 5, 2050
	$750 million of 3.750% Notes due February 5, 2070
April 7, 2020	$750 million of 3.250% Notes due February 5, 2050