Stockholders' Equity Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Loss	$ (141)		$ (17)		$ (444)	$ 12
Other Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service Benefit	(231)	[1],[2]	0	[1],[2]	(692)	0
Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Loss					32	4
Other Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Loss					(475)	1
Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	6	[3]	(22)	[3]	(9)	13
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	(1)	[4]	3	[4]	1	(6)
Amounts Reclassified from Accumulated Other Comprehensive Loss	5		(19)		(8)	7
Actuarial (Gains) Losses | Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	14	[1],[2]	1	[1],[2]	41	3
Actuarial (Gains) Losses | Other Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	23	[1],[2]	1	[1],[2]	70	1
Settlement Loss | Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	0	[1],[2]	0	[1],[2]	1	3
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	14		1		41	5
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	(3)	[4]	0	[4]	(9)	(1)
Amounts Reclassified from Accumulated Other Comprehensive Loss	11		1		32	4
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | Other Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	(208)		1		(623)	1
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	51	[4]	0	[4]	148	0
Amounts Reclassified from Accumulated Other Comprehensive Loss	(157)		1		(475)	1
Unrealized loss on investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax	0	[4]	0	[4]	0	0
Amounts Reclassified from Accumulated Other Comprehensive Loss	0	[1]	0	[1]	7	0
Prior Service Benefit | Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax	0		0		(1)	(1)
Accumulated Defined Benefit Plans Adjustment, Curtailment Gain (Loss) | Other Benefit Plans
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

[1] Reflected in other income - net in the interim Consolidated Statements of Operations.

[2] These accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit credit of the company's pension and other benefit plans. See Note 15 - Pension Plans and Other Post Employment Benefits, for additional information.

[3] Reflected in cost of goods sold in the interim Consolidated Statements of Operations.

[4] Reflected in (benefit from) provision for income taxes from continuing operations in the interim Consolidated Statements of Operations.