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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018				2017				2016
U.S.	$	1,739			$	1,976			$	1,466
Foreign	767				185				172
Total Income Before Income Taxes	$	2,506			$	2,161			$	1,638

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,
	2018				2017				2016
Current tax expense (benefit)
Federal	$	(22	)		$	(137	)		$	(148	)
State	(45		)		(16		)		(28		)
Foreign	249				18				6
Total	182				(135		)		(170		)
Deferred tax expense (benefit)
Federal	425				2,022				998
State	55				4				51
Foreign	(75		)		47				38
Total	405				2,073				1,087
Total tax provision	$	587			$	1,938			$	917

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,
	2018							2017							2016
Federal income tax	$	526			21.0	%		$	756			35.0	%		$	573			35.0	%
Increase (decrease) as a result of:
State deferred tax rate change	(7		)		(0.3	)%		10				0.5	%		11				0.7	%
Taxes on foreign earnings, net of federal benefit	131				5.2	%		42				1.9	%		28				1.7	%
Net effects of noncontrolling interests	(65		)		(2.6	)%		(14		)		(0.7	)%		(4		)		(0.3	)%
State income tax, net of federal benefit	46				1.8	%		38				1.8	%		26				1.6	%
Dividend received deduction	(31		)		(1.2	)%		(56		)		(2.6	)%		(48		)		(2.9	)%
Adjustments to uncertain tax positions	(47		)		(1.9	)%		(12		)		(0.6	)%		(23		)		(1.4	)%
Valuation allowance on investment and tax credits	14				0.5	%		13				0.6	%		34				2.1	%
Impact of the 2017 Tax Reform	—				—	%		1,240				57.4	%		—				—	%
Nondeductible goodwill	58				2.3	%		—				—	%		301				18.5	%
General business credit	(64		)		(2.6	)%		(95		)		(4.4	)%		—				—	%
Other	26				1.2	%		16				0.8	%		19				1.1	%
Total	$	587			23.4	%		$	1,938			89.7	%		$	917			56.1	%

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

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

	December 31,
	2018				2017
Deferred tax assets
Employee benefits	$	238			$	251
Accrued expenses	76				73
Net operating loss, capital loss and tax credit carryforwards	1,526				1,113
Derivative instruments and interest rate and currency swaps	9				12
Debt fair value adjustment	33				37
Investments	177				968
Other	—				6
Valuation allowances	(178		)		(171		)
Total deferred tax assets	1,881				2,289
Deferred tax liabilities
Property, plant and equipment	270				225
Other	45				20
Total deferred tax liabilities	315				245
Net deferred tax assets	$	1,566			$	2,044

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,
	2018				2017				2016
Balance at beginning of period	$	97			$	122			$	148
Additions based on current year tax positions	3				3				3
Additions based on prior year tax positions	7				—				7
Reductions based on prior year tax positions	—				—				(1		)
Reductions based on settlements with taxing authority	(73		)		(22		)		(26		)
Reductions due to lapse in statute of limitations	—				(2		)		(9		)
Impact of the 2017 Tax Reform	—				(4		)		—
Balance at end of period	$	34			$	97			$	122

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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 components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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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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