Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash provided by operating activities:
Net income	$ 260	$ 254
Non-cash charges to net income:
Depreciation and amortization	103	96
Charge for fair value markup of acquired inventory	9
Other	49	65
Changes in working capital:
Accounts receivable and prepaid expenses	7	(57)
Inventories	(36)	(36)
Accounts payable and accrued liabilities	(92)	(63)
Decrease in margin accounts	13	13
Other	(11)	(6)
Cash provided by operating activities	302	266
Cash used for investing activities:
Capital expenditures, net of proceeds on disposals	(144)	(125)
Short-term investments	(8)	(14)
Payments for acquisitions	(13)
Other		(1)
Cash used for investing activities	(165)	(140)
Cash used for financing activities:
Proceeds from borrowings	585	173
Payments on debt	(592)	(196)
Repurchase (Issuance) of common stock - net	(128)	8
Dividends paid (including to non-controlling interests)	(83)	(69)
Cash used for financing activities	(218)	(84)
Effects of foreign exchange rate changes on cash	10	11
(Decrease) increase in cash and cash equivalents	(71)	53
Cash and cash equivalents, beginning of period	512	434
Cash and cash equivalents, end of period	$ 441	$ 487