Stockholders' Equity Reclassifications out of AOCI (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Successor [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Goods Sold		$ 5,669		$ 10,516
Income Tax Expense (Benefit)		141		168
Income from continuing operations after income taxes		514		298
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax		(6)		(7)
Successor [Member] | Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Goods Sold	[1]	(6)		(7)
Income Tax Expense (Benefit)	[2]	2		2
Income from continuing operations after income taxes		(4)		(5)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax				(5)
Successor [Member] | Unrealized loss on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[3]	0		0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	[2]	0		0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax		0		0
Successor [Member] | Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax				(2)
Successor [Member] | Pension Plan | Prior Service Benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]	0		0
Successor [Member] | Pension Plan | Actuarial (Gains) Losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]	(1)		(1)
Successor [Member] | Pension Plan | Settlement Gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]	(1)		(1)
Successor [Member] | Pension Plan | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax		(2)		(2)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	[2]	0		0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax		(2)		(2)
Successor [Member] | Other Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax				0
Successor [Member] | Other Benefit Plans | Prior Service Benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]	0		0
Successor [Member] | Other Benefit Plans | Actuarial (Gains) Losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]	0		0
Successor [Member] | Other Benefit Plans | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax		0		0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	[2]	0		0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax		$ 0		$ 0
Predecessor [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Goods Sold			$ 3,963		$ 8,115
Income Tax Expense (Benefit)			84		281
Income from continuing operations after income taxes			722		1,900
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax			115		237
Predecessor [Member] | Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Goods Sold	[1]		(13)		(21)
Income Tax Expense (Benefit)	[2]		5		8
Income from continuing operations after income taxes			(8)		(13)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax					(13)
Predecessor [Member] | Unrealized loss on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[3]		0		(1)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	[2]		0		0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax			0		(1)
Predecessor [Member] | Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax					244
Predecessor [Member] | Pension Plan | Prior Service Benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]		(1)		(2)
Predecessor [Member] | Pension Plan | Actuarial (Gains) Losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]		189		379
Predecessor [Member] | Pension Plan | Settlement Gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]		0		0
Predecessor [Member] | Pension Plan | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax			188		377
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	[2]		(68)		(133)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax			120		244
Predecessor [Member] | Other Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax					7
Predecessor [Member] | Other Benefit Plans | Prior Service Benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]		(18)		(35)
Predecessor [Member] | Other Benefit Plans | Actuarial (Gains) Losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax	[4]		23		46
Predecessor [Member] | Other Benefit Plans | Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, before Tax			5		11
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	[2]		(2)		(4)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax			$ 3		$ 7

[1] Cost of goods sold.

[2] Provision for income taxes from continuing operations.

[3] Sundry income (expense) - net.

[4] These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit (credit) cost of the company's pension and other benefit plans. See Note 16 for additional information.