Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash provided by operating activities
Net (loss) income	$ (243)	$ 78
Non-cash charges to net (loss) income:
Depreciation and amortization	52	54
Mechanical stores expense	14	13
Deferred income taxes	(4)
Assets held for sale impairment	360
Other	7	13
Changes in working capital:
Accounts receivable and prepaid expenses	(56)	(69)
Inventories	(69)	(33)
Accounts payable and accrued liabilities	(5)	17
Margin accounts	(16)	(20)
Other	(18)	12
Cash provided by operating activities	22	65
Cash used for investing activities
Capital expenditures and mechanical stores purchases, net of proceeds on disposals	(63)	(98)
Short-term investments	(1)	2
Cash used for investing activities	(64)	(96)
Cash (used for) provided by financing activities
Proceeds from borrowings	46	405
Payments on debt	(36)	(303)
Repurchases of common stock, net	(14)
Issuances of common stock for share-based compensation, net of settlements	7	2
Dividends paid, including to non-controlling interests	(43)	(42)
Cash (used for) provided by financing activities	(40)	62
Effects of foreign exchange rate changes on cash	(7)	(17)
(Decrease) increase in cash and cash equivalents	(89)	14
Cash and cash equivalents, beginning of period	665	264
Cash and cash equivalents, end of period	$ 576	$ 278