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Borrowings Under Credit Facilities and Commercial Paper Program
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Borrowings Under Credit Facilities and Commercial Paper Program Borrowings Under Credit Facilities and Commercial Paper Program 
At September 30, 2023, we had a primary unsecured credit facility with a consortium of 31 banks that included a $4,000,000,000 unsecured revolving credit facility, a $1,000,000,000 unsecured term credit facility and a $250,000,000 Canadian-denominated unsecured term credit facility. The unsecured revolving credit facility is comprised of a $1,000,000,000 tranche that matures on June 4, 2026 (none outstanding at September 30, 2023) and a $3,000,000,000 tranche that matures on June 4, 2025 (none outstanding at September 30, 2023). The term credit facilities mature on July 19, 2026. Each tranche of the revolving facility and term loans may be extended for two successive terms of six months at our option. We have an option, through an accordion feature, to upsize the unsecured revolving credit facility and the $1,000,000,000 unsecured term credit facility by up to an additional $1,250,000,000, 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, 2023). Borrowings under the unsecured revolving credit facility are subject to interest payable at the applicable margin over the secured overnight financing rate ("SOFR") interest rate. Based on our current credit ratings, the loans under the unsecured revolving credit facility currently bear interest at 0.775% over the adjusted SOFR rate at September 30, 2023. 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, 2023. 
Under the terms of our commercial paper 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 $1,000,000,000 (none outstanding at September 30, 2023).
The following information relates to aggregate borrowings under the unsecured revolving credit facility and commercial paper program for the periods presented (dollars in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Balance outstanding at quarter end$—$655,000 $—$655,000
Maximum amount outstanding at any month end$—$1,565,000 $205,000$1,565,000
Average amount outstanding (total of daily principal balances divided by days in period)$—$1,047,631 $21,703$937,045
Weighted average interest rate (actual interest expense divided by average borrowings outstanding)— %2.76 %5.05 %1.58 %