Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Income Tax Rate Reconciliation

Income Tax Rate Reconciliation
	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Tax provision at U.S. federal statutory rate [1]	$	112		$	64		$	333		$	105
Tax-exempt interest	(16		)	(31		)	(50		)	(91		)
Executive compensation	1			—			8			—
Stock-based compensation	(3		)	(4		)	(5		)	(12		)
Tax Reform	11			—			13			—
Other	(2		)	7			(2		)	3
Provision for income taxes	$	103		$	36		$	297		$	5

[1]Due to the passage of Tax Reform on December 22, 2017, current and prior period federal statutory rates are reflected at 21% and 35% respectively.

Roll-forward of Unrecognized Tax Benefits

Rollforward of Unrecognized Tax Benefits
	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Balance, beginning of period	$	9	$	12	$	9	$	12
Gross increases - tax positions in prior period	5		—		5		—
Gross decreases - tax positions in prior period	—		—		—		—
Balance, end of period	$	14	$	12	$	14	$	12

Future Tax Benefits

Future Tax Benefits
	As of
	September 30, 2018				Expiration
	Carryover amount		Expected tax benefit, gross		Dates			Amount
Net operating loss carryover - U.S.	$	2,814	$	591	2023	-	2036	$	2,814
Net operating loss carryover - foreign	$	4	$	—	No expiration			$	4
Foreign tax credit carryover	$	5	$	5	2023	-	2024	$	5
General business credit carryover	$	4	$	4	2031	-	2037	$	4