In addition to the outstanding letters of credit issued under the committed facilities discussed above, we had $143.8 million in letters of credit outstanding as of November 20, 2021. These letters of credit have various maturity dates and were issued on an uncommitted basis.
As of November 20, 2021, the $500 million 3.700% Senior Notes due April 2022 are classified as current in the Consolidated Balance Sheets as the Company has the intent to utilize operating cash to fund the repayment.
All Senior Notes are subject to an interest rate adjustment if the debt ratings assigned are downgraded (as defined in the agreements). Further, the Senior Notes contain a provision that repayment may be accelerated if we experience a change in control (as defined in the agreements). Our borrowings under our Senior Notes contain minimal covenants, primarily restrictions on liens, sale and leaseback transactions and consolidations, mergers and the sale of assets. All of the repayment obligations under our borrowing arrangements may be accelerated and come due prior to the applicable scheduled payment date if covenants are breached or an event of default occurs. As of November 20, 2021, we were in compliance with all covenants and expect to remain in compliance with all covenants under our borrowing arrangements.
Our adjusted debt to earnings before interest, taxes, depreciation, amortization, rent and share-based compensation expense (“EBITDAR”) ratio was 2.0:1 as of November 20, 2021 and was 2.3:1 as of November 21, 2020. We calculate adjusted debt as the sum of total debt, financing lease liabilities and rent times six; and we calculate adjusted EBITDAR by adding interest, taxes, depreciation, amortization, rent, and share-based compensation expense to net income. Adjusted debt to EBITDAR is calculated on a trailing four quarter basis. We target our debt levels to a ratio of adjusted debt to EBITDAR in order to maintain our investment grade credit ratings. We believe this is important information for the management of our debt levels. Management expects the ratio of adjusted debt to EBITDAR to return to pre-pandemic levels in the future, increasing debt levels. Once the target ratio is achieved, to the extent adjusted EBITDAR increases, we expect our debt levels to increase; conversely, if adjusted EBITDAR decreases, we would expect our debt levels to decrease. Refer to the “Reconciliation of Non-GAAP Financial Measures” section for further details of our calculation.
Stock Repurchases
From January 1, 1998 to November 20, 2021, we have repurchased a total of 150.8 million shares of our common stock at an aggregate cost of $26.6 billion, including 514,534 shares of our common stock at an aggregate cost of $900.0 million during the twelve week period ended November 20, 2021.
On October 5, 2021, the Board voted to authorize the repurchase of an additional $1.5 billion of our common stock in connection with our ongoing share repurchase program. Since the inception of the repurchase program in 1998, the Board has authorized $27.7 billion in share repurchases. Considering the cumulative repurchases as of November 20, 2021, we had $1.0 billion remaining under the Board’s authorization to repurchase our common stock.
Subsequent to November 20, 2021 and through December 10, 2021, we have repurchased 63,909 shares of our common stock at an aggregate cost of $120.0 million. On December 14, 2021, the Board voted to increase the authorization by $1.5 billion to raise the cumulative share repurchase authorization to $29.2 billion. Considering the cumulative repurchases subsequent to November 20, 2021 and through December 10, 2021 and the December 14, 2021 additional authorization, we have $2.4 billion remaining under the Board’s authorization to repurchase our common stock.
Off-Balance Sheet Arrangements
Since our fiscal year end, we have canceled, issued and modified stand-by letters of credit that are primarily renewed on an annual basis to cover deductible payments to our casualty insurance carriers. Our total stand-by letters of credit commitment at November 20, 2021, was $170.6 million, compared with $162.4 million at August 28, 2021, and our total surety bonds commitment at November 20, 2021, was $36.8 million, compared with $35.4 million at August 28, 2021.