Debt

Short-Term Debt

Google had a short-term debt financing program of up to $3.0 billion through the issuance of commercial paper and a $3.0 billion revolving credit facility as of December 31, 2015. In February 2016, we replaced this program with a new short-term debt financing program of up to $5.0 billion of commercial paper and a $4.0 billion revolving credit facility, which expires in February 2021. Net proceeds from these programs are used for general corporate purposes.

We had $2.0 billion of outstanding commercial paper recorded as short-term debt with a weighted-average interest rate of 0.2% as of December 31, 2015 and no commercial paper outstanding as of December 31, 2016. The estimated fair value of the short-term debt approximated its carrying value as of December 31, 2015.

The interest rate for the credit facility is determined based on a formula using certain market rates. No amounts were outstanding under the credit facility as of December 31, 2015 and December 31, 2016.

In August 2013, we entered into a capital lease obligation on certain property expiring in 2028. In September 2016, we exercised our option to purchase the property for approximately $220 million.

Long-Term Debt

Google issued $3.0 billion of unsecured senior notes in three tranches (collectively, the "2011 Notes") in May 2011, due in 2014, 2016, and 2021, as well as $1.0 billion of unsecured senior notes (the "2014 Notes") in February 2014 due 2024.

In April 2016, we completed an exchange offer with eligible holders of Google’s 2011 Notes due 2021 and 2014 Notes due 2024 (collectively, the "Google Notes"). An aggregate principal amount of approximately $1.7 billion of the Google Notes was exchanged for approximately $1.7 billion of Alphabet notes with identical interest rate and maturity. Because the exchange was between a parent and the subsidiary company and for substantially identical notes, the change was treated as a debt modification for accounting purposes with no gain or loss recognized.

In August 2016, Alphabet issued $2.0 billion of unsecured senior notes (the "2016 Notes") due 2026. The net proceeds from the issuance of the 2016 Notes were used for general corporate purposes, including the repayment of outstanding commercial paper. The Alphabet notes due in 2021, 2024, and 2026 rank equally with each other and are structurally subordinated to the outstanding Google Notes.

The total outstanding long-term debt is summarized below (in millions):



	As of December 31, 2015			As of December 31, 2016

Short-Term Portion of Long-Term Debt
2.125% Notes due on May 19, 2016	$	1,000		$	0
Capital Lease Obligation	225			0
Total Short-Term Portion of Long-Term Debt	$	1,225		$	0

Long-Term Debt
3.625% Notes due on May 19, 2021	$	1,000		$	1,000
3.375% Notes due on February 25, 2024	1,000			1,000
1.998% Notes due on August 15, 2026	0			2,000
Unamortized discount for the Notes above	(5		)	(65		)
Total Long-Term Debt⁽¹⁾	$	1,995		$	3,935

⁽¹⁾Includes the outstanding (and unexchanged) Google Notes issued in 2011 and 2014 and the Alphabet notes exchanged in 2016.

The effective interest yields based on proceeds received from the outstanding notes due in 2021, 2024 and 2026 were 3.734%, 3.377% and 2.231% respectively, with interest payable semi-annually. We may redeem these notes at any time in whole or in part at specified redemption prices. The total estimated fair value of all outstanding notes was approximately $3.1 billion as of December 31, 2015 and $3.9 billion as of December 31, 2016. The fair value was determined based on observable market prices of identical instruments in less active markets and is categorized accordingly as Level 2 in the fair value hierarchy.

As of December 31, 2016, aggregate future principal payments for long-term debt were as follows (in millions):



Years Ending
2017	$	0
2018	0
2019	0
2020	0
Thereafter	4,000
Total	$	4,000