Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income attributable to controlling and noncontrolling interests	$ 1,108	$ 2,070
Less: Income from discontinued operations	(1)	(1,005)
Income from continuing operations	1,107	1,065
Adjustments to reconcile net income to cash from operations:
Depreciation and amortization	370	353
Pension expense	77	49
Stock-based compensation expense	43	53
Business restructuring	140	0
Environmental remediation charge	0	138
Equity affiliate earnings, net of distributions received	(20)	(55)
Deferred income taxes	(42)	(59)
Cash contributions to pension plans	(286)	(12)
Restructuring cash spending	(31)	(41)
Change in certain asset and liability accounts:
Receivables	(419)	(416)
Inventories	(80)	(205)
Other current assets	(96)	(86)
Accounts payable and accrued liabilities	149	433
Taxes and interest payable	150	107
Noncurrent assets and liabilities, net	61	120
Other	(15)	40
Cash from operating activities - continuing operations	986	1,244
Cash used for operating activities - discontinued operations	0	(207)
Cash from operating activities	986	1,037
Investing activities:
Capital expenditures	(266)	(358)
Business acquisitions, net of cash balances acquired	(248)	(114)
Proceeds from the disposition of PPG's interest in the Transitions Optical joint venture and sunlens business	47	1,625
Proceeds from the sale of assets	0	56
Purchase of short-term investments	(97)	(936)
Proceeds from maturity of short-term investments	171	960
Payments on cross currency swap contracts	(34)	(45)
Proceeds from cross currency swap and foreign currency contracts	37	37
Other	39	(4)
Cash (used for) / from investing activities - continuing operations	(351)	1,221
Cash used for investing activities - discontinued operations	0	(1)
Cash (used for) / from investing activities	(351)	1,220
Financing activities:
Net change in borrowing with maturities of three months or less	(18)	(14)
Net payments on commercial paper and short-term debt	(392)	0
Proceeds from the issuance of debt	1,242	0
Repayment of long-term debt	(339)	(39)
Purchase of treasury stock	(501)	(450)
Issuance of treasury stock	51	52
Dividends paid on PPG common stock	(287)	(269)
Acquisition of noncontrolling interest	0	(39)
Other	(24)	(17)
Cash used for financing activities - continuing operations	(268)	(776)
Cash used for financing activities - discontinued operations	0	(40)
Cash used for financing activities	(268)	(816)
Effect of currency exchange rate changes on cash and cash equivalents	(38)	(89)
Net increase in cash and cash equivalents	329	1,352
Cash and cash equivalents, beginning of period	686	1,116
Cash and cash equivalents, end of period	1,015	2,468
Interest paid, net of amount capitalized	78	160
Taxes paid, net of refunds	$ 291	$ 504