Reclassifications From Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 22, 2021
Reclassifications from accumulated other comprehensive (loss) income
Other, net	$ 43		$ 44	$ 691	$ 132
Tax (benefit)	(103)		(87)	(158)	(202)
Reclassifications, after tax	(239)		(293)	(338)	(1,065)
Interest expense	26		40	253	110
Disproportionate tax expense		$ 11
5.95 Notes and Debentures Due March 15, 2022
Reclassifications from accumulated other comprehensive (loss) income
Debt instrument stated interest rate						5.95%
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest
Reclassifications from accumulated other comprehensive (loss) income
Defined benefit plan actuarial loss			0	447	0
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications from accumulated other comprehensive (loss) income
Defined benefit plan actuarial loss				447
Tax (benefit)		96
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest
Reclassifications from accumulated other comprehensive (loss) income
Other, net	2		7	18	20
Defined benefit plan actuarial loss	0	447
Tax (benefit)	0		2	100	5
Reclassifications, after tax	2		5	365	15
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Reclassifications from accumulated other comprehensive (loss) income
Tax (benefit)	0		0	(5)	0
Reclassifications, after tax	0		0	(7)	(1)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Interest Rate Swap
Reclassifications from accumulated other comprehensive (loss) income
Interest expense	$ 0		$ 0	2	1
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Foreign Currency Adjustment Attributable to Parent | Hüppe
Reclassifications from accumulated other comprehensive (loss) income
Other, net		$ (23)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Foreign Currency Adjustment Attributable to Parent | UK Window Group
Reclassifications from accumulated other comprehensive (loss) income
Other, net					$ (14)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent | Hüppe
Reclassifications from accumulated other comprehensive (loss) income
Other, net				$ (3)