Reclassifications from Accumulated Other Comprehensive Income (AOCI) - Detail of Amounts Reclassified From Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings (loss) before income taxes	$ 4,344	$ (1,307)	$ (452)
Tax provision	(170)	142	(178)
Net of tax	4,174	(1,165)	(630)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings (loss) before income taxes	287	182	191
Tax provision	(72)	(41)	(48)
Net of tax	215	141	143
Pension and Other Benefit Items | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs (a)	(27)	(4)	31
Actuarial losses (a)	109	129	135
Settlements, termination and curtailment gains (a)	100	2	3
UPI purchase accounting adjustment	0	23	0
Total pensions and other benefits items	182	150	169
Unrealized Gain (Loss) on Derivatives | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Derivative reclassifications to Consolidated Statements of Operations	$ 105	$ 32	$ 22