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Borrowings Under Credit Facilities and Commercial Paper Program
 6 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Borrowings Under Credit Facilities and Commercial Paper Program Borrowings Under Credit Facilities and Commercial Paper Program 
At June 30, 2024, 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 June 30, 2024) and a $3,000,000,000 tranche that matures on June 4, 2025 (none outstanding at June 30, 2024). 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 June 30, 2024). 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 June 30, 2024. 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, 2024. 
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 $1,000,000,000 (none outstanding at June 30, 2024).
The following information relates to aggregate borrowings under the unsecured revolving credit facility and commercial paper program for the periods presented (dollars in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Balance outstanding at quarter end$—$— $—$—
Maximum amount outstanding at any month end$—$— $—$205,000
Average amount outstanding (total of daily principal balances divided by days in period)$—$— $—$32,735
Weighted average interest rate (actual interest expense divided by average borrowings outstanding)— %— %— %5.05 %
In July 2024, we closed on an expanded $5,000,000,000 unsecured revolving credit facility, which replaced our $4,000,000,000 existing line of credit. The new facility is comprised of a $3,000,000,000 revolving line of credit maturing in June 2028 that can be extended for an additional year and a $2,000,000,000 revolving line of credit maturing in June 2029. The revolving lines of credit will bear interest at a borrowing rate of 0.725% over the adjusted SOFR rate and includes an annual facility fee of 0.125%.