Stockholders' Equity Reclassifications out of AOCI (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018		Sep. 30, 2019		Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Goods Sold		$ 1,349		$ 1,485		$ 6,607		$ 7,924
Income Tax Expense (Benefit)		(104)		(8)		99		(187)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		(527)	$ (184)	(5,642)	[1]	(228)	[1]	(5,705)	[1]
Amounts Reclassified from Accumulated Other Comprehensive Income (loss)		3		0		15		(7)
Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Goods Sold	[2]	1		1		13		(6)
Income Tax Expense (Benefit)	[3]	0		(1)		(1)		1
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		1		0		12		(5)
Amounts Reclassified from Accumulated Other Comprehensive Income (loss)						12		(5)
Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Income (loss)						4		(2)
Pension Plan | Actuarial (Gains) Losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	[4]	1		2		2		1
Pension Plan | Settlement Gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	[4]	1		(1)		2		(2)
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 Income (Loss), Current Period, before Tax		2		1		4		(1)
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	[3]	0		(1)		0		(1)
Amounts Reclassified from Accumulated Other Comprehensive Income (loss)		2		0		4		(2)
Other Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Income (loss)						(1)		0
Other Benefit Plans | Actuarial (Gains) Losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	[4]	0		0		(1)		0
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 Income (Loss), Current Period, before Tax		0		0		(1)		0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	[3]	0		0		0		0
Amounts Reclassified from Accumulated Other Comprehensive Income (loss)		$ 0		$ 0		$ (1)		$ 0

[1] Periods prior to March 31, 2019 are on a pro forma basis, prepared in accordance with Article 11 of Regulation S-X.

[2] Cost of goods sold.

[3] (Benefit from) provision for income taxes from continuing operations.

[4] These accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit (credit) cost of the company's pension and other benefit plans. See Note 20 - Pension Plans and Other Post Employment Benefits, for additional information.