8.Notes Payable

Our senior unsecured notes and bonds consist of the following, sorted by maturity date (dollars in millions):

	June 30,			December 31,
	2016			2015
5.950% notes, issued in September 2006 and due in September 2016	$	275		$	275
5.375% notes, issued in September 2005 and due in September 2017	175			175
2.000% notes, issued in October 2012 and due in January 2018	350			350
6.750% notes, issued in September 2007 and due in August 2019	550			550
5.750% notes, issued in June 2010 and due in January 2021	250			250
3.250% notes, issued in October 2012 and due in October 2022	450			450
4.650% notes, issued in July 2013 and due in August 2023	750			750
3.875% notes, issued in June 2014 and due in July 2024	350			350
4.125% notes, issued in September 2014 and due in October 2026	250			250
5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035	250			250

Total principal amount	3,650			3,650
Unamortized original issuance discounts and deferred financing costs	(30		)	(32		)

	$	3,620		$	3,618

The following table summarizes the maturity of our notes and bonds payable as of June 30, 2016, excluding unamortized original issuance discounts and deferred financing costs (dollars in millions):

Year of Maturity	Principal
2016	$	275
2017	175
2018	350
2019	550
2020	-
Thereafter	2,300

Totals	$	3,650

As of June 30, 2016, the weighted average interest rate on our notes and bonds payable was 4.7% and the weighted average remaining years until maturity was 6.0 years. In September 2016, we expect to repay our $275 million 5.95% notes.