Other (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (5)	$ (8)	$ (11)	$ (21)
Other - net	(5)	(17)	(27)	(49)
Gain (Loss) on Extinguishment of Debt	0	(14)	0	(14)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	82		82
Gain (Loss) on Sale and Revaluation of Assets	28	53	39	45
Other (Income) Expense - Net	49	(56)	16	(80)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (5)	$ (8)	$ (11)	$ (21)