AOCL (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (1,534)	$ (1,686)	$ (1,551)
Other Comprehensive Income (Loss), Net of Tax	(17)	(84)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(55)	(55)	(53)	$ (55)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2)	0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1,479)	(1,631)	$ (1,498)	$ (1,715)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	67
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	87
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	(20)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	25	22
Reclassification from AOCI, Current Period, Tax	(6)	(5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	19	17
Other Comprehensive Income (Loss), Net of Tax	$ 19	$ 84