Borrowings

CSC’s Senior Notes are unsecured obligations and rank equally with the other unsecured senior debt. CSC may redeem some or all of the Senior Notes of each series prior to their maturity, subject to certain restrictions, and the payment of an applicable make-whole premium in certain instances. Interest is payable semi-annually for the fixed-rate Senior Notes and quarterly for the floating-rate Senior Notes. The following table lists long-term debt by instrument outstanding as of March 31, 2019 and December 31, 2018:



	Date of	Principal Amount Outstanding
	Issuance	March 31, 2019			December 31, 2018
Fixed-rate Senior Notes:
4.450% due July 22, 2020	07/22/10	$	700		$	700
3.250% due May 21, 2021	05/22/18	600			600
3.225% due September 1, 2022	08/29/12	256			256
2.650% due January 25, 2023	12/07/17	800			800
3.550% due February 1, 2024	10/31/18	500			500
3.000% due March 10, 2025	03/10/15	375			375
3.850% due May 21, 2025	05/22/18	750			750
3.450% due February 13, 2026	11/13/15	350			350
3.200% due March 2, 2027	03/02/17	650			650
3.200% due January 25, 2028	12/07/17	700			700
4.000% due February 1, 2029	10/31/18	600			600
Floating-rate Senior Notes:
Three-month LIBOR + 0.32% due May 21, 2021	05/22/18	600			600
Total Senior Notes		6,881			6,881
5.450% Finance lease obligation ⁽¹⁾	06/04/04	—			52
Unamortized discount — net		(14		)	(15		)
Debt issuance costs		(38		)	(40		)
Total long-term debt		$	6,829		$	6,878

⁽¹⁾The finance lease obligation was extinguished through an assignment agreement during the first quarter of 2019.

Annual maturities on long-term debt outstanding at March 31, 2019 are as follows:



	Maturities
2019	$	—
2020	700
2021	1,200
2022	256
2023	800
Thereafter	3,925
Total maturities	6,881
Unamortized discount — net	(14		)
Debt issuance costs	(38		)
Total long-term debt	$	6,829

Short-term borrowings: Our banking subsidiaries maintain secured credit facilities with the FHLB. Amounts available under these facilities are dependent on the amount of our First Mortgages, HELOCs, and the fair value of certain of their investment securities that are pledged as collateral. As of March 31, 2019 and December 31, 2018, the collateral pledged provided a total borrowing capacity of $36.1 billion and $35.5 billion, respectively, of which no amounts were outstanding at the end of either period.

As a condition of the FHLB borrowings, we are required to hold FHLB stock, which was recorded in other assets on the condensed consolidated balance sheets. The investment in FHLB was $34 million at March 31, 2019 and $32 million at December 31, 2018.