among other things, the ability of the Company’s subsidiaries to incur indebtedness; the ability of the Company and its subsidiaries to grant certain liens, make restricted payments, materially change the nature of its or their business, make investments, guarantees, loans or advances in non-subsidiaries or enter into certain hedging agreements; the ability of the Company’s material subsidiaries to enter into certain restrictive agreements; the ability of the Company and its material subsidiaries to enter into certain affiliate transactions; the ability of the Company and its subsidiaries to redeem any senior notes; and the Company’s ability to merge or consolidate with any person or sell all or substantially all of its assets to any person. The Company and its subsidiaries are also prohibited from using the proceeds under the Credit Facility in violation of Sanctions (as defined in the Credit Facility). In addition, the representations, warranties and covenants contained in the Credit Facility are subject to certain exceptions and/or standards of materiality applicable to the contracting parties.

Events of Default. The Credit Facility includes customary events of default, including events of default relating to:

• non-payment of principal, interest or fees;

• inaccuracy of representations and warranties in any material respect when made or when deemed made;

• violation of covenants;

• cross payment-defaults;

• cross acceleration;

• bankruptcy and insolvency events;

• certain unsatisfied judgments;

• a change of control; and

• during any secured period, the failure of the collateral documents to be in effect or a lien to be valid and perfected.

If an event of default with respect to a borrower occurs under the Credit Facility, the lenders will be able to terminate the commitments and accelerate the maturity of the loans of the defaulting borrower under the Credit Facility and exercise other rights and remedies.

# Senior Notes

The following table summarizes the face values, maturity dates, semi-annual interest payment dates, and optional redemption periods related to the Company’s outstanding unsecured senior note obligations at December 31, 2017.

Senior Note	Face Value
(Millions)	Maturity Date	Interest Payment
Dates	Optional
Redemption
Period(a)
7.500% Senior Notes due 2020 (the “2020 Notes”)	$ 350	August 1, 2020	February 1, August
1	July 1, 2020
6.000% Senior Notes due 2022 (the “2022 Notes”)	$ 1,100	January 15, 2022	January 15, July
15	October 15, 2021
8.250% Senior Notes due 2023 (the “2023 Notes”)	$ 500	August 1, 2023	February 1, August
1	June 1, 2023
5.250% Senior Notes due 2024 (the “2024 Notes”)	$ 650	September 15, 2024	March 15,
September 15	June 15, 2024

(a) At any time prior to these dates, we have the option to redeem some or all of the notes at a specified “make whole” premium as described in the indenture(s) governing the notes to be redeemed. On or after these dates, we have the option to redeem the notes, in whole or in part, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest thereon to the redemption date as more fully described in the indenture.

During third-quarter 2017, we issued an additional \$150 million of our 5.25% senior notes due 2024. The proceeds were used to fund the tender offer of\$150 million of our 7.50% senior notes due 2020. As a result, we recorded a loss on extinguishment of debt of \$17 million .

The terms of the indentures governing our 2020 Notes, 2022 Notes, 2023 Notes and 2024 Notes are substantially identical.

Change of Control. If we experience a change of control (as defined in the indentures governing the notes) accompanied by a specified rating decline, we must offer to repurchase the notes of such series at 101% of their principal amount, plus accrued and unpaid interest.