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Borrowings Under Credit Facilities and Commercial Paper Program
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Borrowings Under Credit Facilities and Commercial Paper Program Borrowings Under Credit Facilities and Commercial Paper Program 
At June 30, 2020, we had a primary unsecured credit facility with a consortium of 31 banks that includes a $3,000,000,000 unsecured revolving credit facility (none outstanding at June 30, 2020), a $500,000,000 unsecured term credit facility and a $250,000,000 Canadian-denominated unsecured term credit facility. We have an option, through an accordion feature, to upsize the unsecured revolving credit facility and the $500,000,000 unsecured term credit facility by up to an additional $1,000,000,000, in the aggregate, and the $250,000,000 Canadian-denominated unsecured term credit facility by up to an additional $250,000,000. The primary unsecured credit facility also allows us to borrow up to $1,000,000,000 in alternate currencies (none outstanding at June 30, 2020). Borrowings under the unsecured revolving credit facility are subject to interest payable at the applicable margin over LIBOR interest rate. The applicable margin is based on our debt ratings and was 0.825% at June 30, 2020. In addition, we pay a facility fee quarterly to each bank based on the bank’s commitment amount. The facility fee depends on our debt ratings and was 0.15% at June 30, 2020. The term credit facilities mature on July 19, 2023. The revolving credit facility is scheduled to mature on July 19, 2022 and can be extended for two successive terms of six months each at our option.
In January 2019, we established an unsecured commercial paper program. Under the terms of the program, we may issue unsecured commercial paper notes with maturities that vary, but do not exceed 397 days from the date of issue, up to a maximum aggregate face or principal amount outstanding at any time of $1,000,000,000 (none outstanding at June 30, 2020).
The following information relates to aggregate borrowings under the unsecured revolving credit facility and commercial paper program for the periods presented (dollars in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Balance outstanding at quarter end$—  $1,870,000  $—  $1,870,000  
Maximum amount outstanding at any month end$685,000  $2,880,000  $2,100,000  $2,880,000  
Average amount outstanding (total of daily
principal balances divided by days in period)
$405,165  $1,807,631  $999,490  $1,301,883  
Weighted average interest rate (actual interest
expense divided by average borrowings outstanding)
1.57 %3.08 %2.08 %3.11 %