CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ 2,033	$ (1,232)	$ (5,269)
Items related to employee benefit plans:
Change in net actuarial loss, net of $(134), $26, and $60 tax	424	(92)	(195)
Settlement charges recognized in net income (loss), net of $(93), $— and $— tax	290	0	0
Change in net prior service cost, net of $(5), $(12), and $(4) tax	14	33	13
Curtailment loss, net of $—, $(1), and $— tax	0	3	0
Reclassification of realized loss on interest rate swaps to net income (loss), net of $(20), $(16), and $— tax	63	46	2
Unrealized holding loss on interest rate swaps, net of $—, $29, and $12 tax	(1)	(86)	(41)
Foreign currency translation adjustment, net of $30, $(43), and $(6) tax	(135)	(37)	2
Net Change in AOCL	655	(133)	(219)
COMPREHENSIVE INCOME (LOSS)	$ 2,688	$ (1,365)	$ (5,488)