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Borrowings Under Credit Facilities and Commercial Paper Program
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Borrowings Under Credit Facilities and Commercial Paper Program Borrowings Under Credit Facilities and Commercial Paper Program 
 At September 30, 2019, we had a primary unsecured credit facility with a consortium of 31 banks that includes a $3,000,000,000 unsecured revolving credit facility ($500,000,000 outstanding at September 30, 2019), 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 September 30, 2019). Borrowings under the unsecured revolving credit facility are subject to interest payable at the applicable margin over LIBOR interest rate (2.84% at September 30, 2019). The applicable margin is based on our debt ratings and was 0.825% at September 30, 2019. 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 September 30, 2019. 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 (the "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. As of September 30,
2019, there was a balance of $834,586,000 outstanding on the Commercial Paper Program ($835,000,000 in principal outstanding net of an unamortized discount of $414,000), which reduces the borrowing capacity on the unsecured revolving credit facility. The notes bear interest at various floating rates with a weighted average of 2.32% as of September 30, 2019 and a weighted average maturity of eight days as of September 30, 2019.
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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2019
 
2018
 
2019
 
2018
Balance outstanding at quarter end
 
$
1,335,000

 
$
1,312,000

 
$
1,335,000

 
$
1,312,000

Maximum amount outstanding at any month end
 
$
1,335,000

 
$
2,148,000

 
$
2,880,000

 
$
2,148,000

Average amount outstanding (total of daily
 
 
 
 
 
 
 
 
principal balances divided by days in period)
 
$
1,296,185

 
$
1,519,000

 
$
1,299,963

 
$
819,516

Weighted average interest rate (actual interest
 
 
 
 
 
 
 
 
expense divided by average borrowings outstanding)
 
2.82
%
 
3.00
%
 
3.02
%
 
2.95
%