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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

The components of “Income Before Income Taxes” are as follows (in millions):

	Year Ended December 31,
	2017				2016				2015
U.S.	$	1,976			$	1,466			$	611
Foreign	185				172				161
Total Income Before Income Taxes	$	2,161			$	1,638			$	772

Schedule of Components of Income Tax Expense (Benefit)

Components of the income tax provision applicable for federal, foreign and state taxes are as follows (in millions): 

	Year Ended December 31,
	2017				2016				2015
Current tax expense (benefit)
Federal	$	(137	)		$	(148	)		$	(125	)
State	(16		)		(28		)		(7		)
Foreign	18				6				4
Total	(135		)		(170		)		(128		)
Deferred tax expense (benefit)
Federal	2,022				998				653
State	4				51				(4		)
Foreign	47				38				43
Total	2,073				1,087				692
Total tax provision	$	1,938			$	917			$	564

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The difference between the statutory federal income tax rate and our effective income tax rate is summarized as follows (in millions, except percentages):

	Year Ended December 31,
	2017							2016							2015
Federal income tax	$	756			35.0	%		$	573			35.0	%		$	271			35.0	%
Increase (decrease) as a result of:
State deferred tax rate change	10				0.5	%		11				0.7	%		(24		)		(3.1	)%
Taxes on foreign earnings, net of federal benefit	42				1.9	%		28				1.7	%		26				3.5	%
Net effects of noncontrolling interests	(14		)		(0.7	)%		(4		)		(0.3	)%		15				2.0	%
State income tax, net of federal benefit	38				1.8	%		26				1.6	%		12				1.5	%
Dividend received deduction	(56		)		(2.6	)%		(48		)		(2.9	)%		(51		)		(6.6	)%
Adjustments to uncertain tax positions	(12		)		(0.6	)%		(23		)		(1.4	)%		(14		)		(1.9	)%
Valuation allowance on investment and tax credits	13				0.6	%		34				2.1	%		—				—	%
Impact of the 2017 Tax Reform	1,240				57.4	%		—				—	%		—				—	%
Nondeductible goodwill	—				—	%		301				18.5	%		323				41.7	%
General business credit	(95		)		(4.4	)%		—				—	%		—				—	%
Other	16				0.8	%		19				1.1	%		6				0.8	%
Total	$	1,938			89.7	%		$	917			56.1	%		$	564			72.9	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Deferred tax assets and liabilities result from the following (in millions):

	December 31,
	2017				2016
Deferred tax assets
Employee benefits	$	251			$	401
Accrued expenses	73				118
Net operating loss, capital loss and tax credit carryforwards	1,113				1,307
Derivative instruments and interest rate and currency swaps	12				22
Debt fair value adjustment	37				74
Investments	968				2,804
Other	6				14
Valuation allowances	(171		)		(184		)
Total deferred tax assets	2,289				4,556
Deferred tax liabilities
Property, plant and equipment	225				177
Other	20				27
Total deferred tax liabilities	245				204
Net deferred tax assets	$	2,044			$	4,352

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of our gross unrecognized tax benefit excluding interest and penalties is as follows (in millions): 

	Year Ended December 31,
	2017				2016				2015
Balance at beginning of period	$	122			$	148			$	189
Additions based on current year tax positions	3				3				4
Additions based on prior year tax positions	—				7				—
Reductions based on prior year tax positions	—				(1		)		(6		)
Reductions based on settlements with taxing authority	(22		)		(26		)		(25		)
Reductions due to lapse in statute of limitations	(2		)		(9		)		(14		)
Impact of the 2017 Tax Reform	(4		)		—				—
Balance at end of period	$	97			$	122			$	148

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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