Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Contingency [Line Items]

Income Tax Rate Reconciliation

Income Tax Rate Reconciliation
	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Tax provision at U.S. federal statutory rate [1]	$	112		$	(99	)	$	221		$	41
Tax-exempt interest	(17		)	(30		)	(34		)	(60		)
Executive compensation	3			—			7			—
Stock-based compensation	—			(1		)	(2		)	(8		)
Other	5			1			2			(4		)
Provision for income taxes	$	103		$	(129	)	$	194		$	(31	)

[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 June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Balance, beginning of period	$	9	$	12	$	9	$	12
Gross increases - tax positions in prior period	—		—		—		—
Gross decreases - tax positions in prior period	—		—		—		—
Balance, end of period	$	9	$	12	$	9	$	12

Future Tax Benefits

Future Tax Benefits
	As of
	June 30, 2018				Expiration
	Carryover amount		Expected tax benefit, gross		Dates			Amount
Net operating loss carryover - U.S.	$	3,219	$	676	2023	-	2036	$	3,219
Net operating loss carryover - foreign	$	4	$	—	No expiration			$	4
Foreign tax credit carryover	$	14	$	14	2023	-	2024	$	14
General business credit carryover	$	4	$	4	2031	-	2037	$	4