9. Long-term Debt

A summary of Long-term Debt follows:

(Stated in millions)

	Sept. 30,		Dec. 31,
	2017		2016
Commercial paper borrowings	$	2,393	$	2,421
4.00% Senior Notes due 2025		1,741		1,740
3.30% Senior Notes due 2021		1,595		1,594
3.00% Senior Notes due 2020		1,593		1,591
3.65% Senior Notes due 2023		1,492		1,491
2.35% Senior Notes due 2018		1,298		1,297
4.20% Senior Notes due 2021		1,100		1,100
2.40% Senior Notes due 2022		996		996
3.63% Senior Notes due 2022		846		845
0.63% Guaranteed Notes due 2019		704		622
1.50% Guaranteed Notes due 2019		599		536
7.00% Notes due 2038		213		214
4.50% Notes due 2021		136		137
5.95% Notes due 2041		115		116
3.60% Notes due 2022		110		110
5.13% Notes due 2043		99		99
4.00% Notes due 2023		82		83
3.70% Notes due 2024		56		56
6.38% Notes due 2018		-		297
Other		703		1,118
	$	15,871	$	16,463

The estimated fair value of Schlumberger’s Long-term Debt, based on quoted market prices at September 30, 2017 and December 31, 2016, was $16.2 billion and $16.8 billion, respectively.

Borrowings under the commercial paper program at September 30, 2017 were $2.4 billion, all of which was classified within Long-term Debt in the Consolidated Balance Sheet. At December 31, 2016, borrowings under the commercial paper program were $2.6 billion, of which $2.4 billion was classified within Long-term debt and $0.2 billion was classified in Short-term borrowings and current portion of long-term debt in the Consolidated Balance Sheet.