SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Notes)

12 Months Ended

Dec. 31, 2021

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

			Additions (Deductions)
	Balance at		Charged to			Charged to			Other			Balance at
	Beginning of		Costs and			Other			(Deductions)			End of
	Year		Expense			Accounts			Additions			Year
Reserves and allowances deducted
from asset accounts:
Valuation allowance for deferred tax assets
Year Ended December 31, 2021	$	4,732	$	(596)	a	$	(49)	b	$	—		$	4,087
Year Ended December 31, 2020	4,576		200		c	(16)		b	(28)		d	4,732
Year Ended December 31, 2019	4,507		50		e	19		b	—			4,576
Reserves for non-income taxes:
Year Ended December 31, 2021	$	82	$	18		$	—		$	(41)	f	$	59
Year Ended December 31, 2020	58		21			(1)			4		f	82
Year Ended December 31, 2019	62		—			—			(4)		f	58

a.Primarily relates to a $219 million decrease associated with U.S. federal net operating losses (NOLs) utilized during 2021, a $105 million decrease related to expiration of U.S. foreign tax credits, and a $228 million decrease associated with PT Rio Tinto NOLs resulting from positive evidence supporting future taxable income against which NOLs can be used.

b.Relates to a valuation allowance for tax benefits primarily associated with actuarial (gains) losses for U.S. defined benefit plans included in other comprehensive income (loss).

c.Primarily relates to a $250 million increase in U.S. federal NOL carryforwards, partly offset by a $75 million decrease in U.S. foreign tax credits associated with expirations, and a $11 million decrease in U.S. deferred tax assets for which no benefit is expected to be realized.

d.Relates to sale of interest in Kisanfu.

e.Primarily relates to a $208 million increase in U.S. federal deferred tax assets for which no benefit is expected to be realized, partly offset by a $98 million decrease in U.S. foreign tax credits associated with expirations and prior-year adjustments, and a $44 million decrease in U.S. federal and state NOL carryforwards

f.Represents amounts paid or adjustments to reserves based on revised estimates.