Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Summary of Operating Loss Carryforwards [Table Text Block]

Components of the net operating loss carryforwards as of December 31, 2018
($ in millions)	20-Year Carryforward Expires in 2025-2036		Indefinite Carryforward Period		Total
US Federal	$	149	$	60	$	209
Foreign	—		30		30
Total	$	149	$	90	$	239

Reconciliation of the change in the amount of unrecognized tax benefits

Reconciliation of the change in the amount of unrecognized tax benefits
	For the years ended December 31,
($ in millions)	2018		2017		2016
Balance – beginning of year	$	55	$	10	$	7
Increase for tax positions taken in a prior year	3		34		—
Increase for tax positions taken in the current year	12		11		3
Balance – end of year	$	70	$	55	$	10

Components of the deferred income tax assets and liabilities

Components of the deferred income tax assets and liabilities
	As of December 31,
($ in millions)	2018			2017
Deferred tax assets
Unearned premium reserves	$	594		$	545
Accrued compensation	145			137
Pension	192			86
Discount on loss reserves	67			53
Net operating loss carryover	50			50
Other assets	57			49
Other postretirement benefits	45			48
Total deferred tax assets	1,150			968
Deferred tax liabilities
DAC	(854		)	(770		)
Unrealized net capital gains	(2		)	(422		)
Life and annuity reserves	(194		)	(241		)
Intangible assets	(145		)	(113		)
Investments	(278		)	(106		)
Other liabilities	(102		)	(98		)
Total deferred tax liabilities	(1,575		)	(1,750		)
Net deferred tax liability	$	(425	)	$	(782	)

Components of income tax expense

Components of income tax expense
	For the years ended December 31,
($ in millions)	2018			2017			2016
Current	$	704		$	1,018		$	654
Deferred	(236		)	(23		)	188
Total income tax expense	$	468		$	995		$	842

Reconciliation of the statutory federal income tax rate to the effective income tax rate on income from operations

Reconciliation of the statutory federal income tax rate to the effective income tax rate
	For the years ended December 31,
	2018		2017		2016
Statutory federal income tax rate on income from operations	21.0	%	35.0	%	35.0	%
Tax Legislation benefit	(1.1	)	(11.2	)	—
Share-based payments	(0.6	)	(1.4	)	—
Tax-exempt income	(0.9	)	(0.7	)	(1.2	)
Tax credits	(1.3	)	(1.3	)	(1.3	)
Non-deductible goodwill impairment	—		1.0		—
Other	0.7		0.5		(0.7	)
Effective income tax rate on income from operations	17.8	%	21.9	%	31.8	%