CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (770)	$ 107	$ (6,942)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	357	446	434
Impairment of goodwill, intangibles and other assets	1,503	1,335	9,801
(Gain) loss from sale of businesses, net	9	(7)	(833)
Deferred income taxes	(261)	(1,068)	(1,585)
Stock based compensation expense	41	42	76
Pension settlement charge	53	1	2
Loss on extinguishment of debt	20	28	4
Loss on change in fair value of investments	0	21	0
Other, net	1	4	3
Changes in operating accounts excluding the effects of divestitures:
Accounts receivable	168	311	162
Inventories	(29)	131	126
Accounts payable	415	(109)	(309)
Accrued liabilities and other	(75)	(198)	(259)
Net cash provided by operating activities	1,432	1,044	680
Cash flows from investing activities:
Proceeds from sale of divested businesses	16	996	5,133
Capital expenditures	(259)	(265)	(384)
Other investing activities	15	5	58
Net cash provided by (used in) investing activities	(228)	736	4,807
Cash flows from financing activities:
Net short term debt	(26)	(26)	(904)
Net proceeds from issuance of debt	491	0	0
Payments on current portion of long-term debt	(305)	(268)	0
Payments on long-term debt	(320)	(1,004)	(2,580)
Debt extinguishment and issuance costs	(18)	(39)	(10)
Repurchase of shares of common stock	0	0	(1,507)
Cash dividends	(392)	(391)	(435)
Payments to dissenting shareholders	0	(171)	0
Equity compensation activity and other, net	11	(5)	(18)
Net cash used in financing activities	(559)	(1,904)	(5,454)
Exchange rate effect on cash, cash equivalents and restricted cash	5	(1)	(23)
Increase (decrease) in cash, cash equivalents and restricted cash	650	(125)	10
Cash, cash equivalents and restricted cash at beginning of period	371	496	486
Cash, cash equivalents and restricted cash at end of period	1,021	371	496
Supplemental disclosures:
Restricted cash at beginning of period	22	0	0
Restricted cash at end of period	40	22	0
Cash paid for income taxes, net of refunds	106	156	292
Cash paid for interest	281	304	458
Net cash provided by (used in) discontinued operating activities	0	(46)	123
Net cash provided by discontinued investing activities	0	978	5,015
Capital expenditures for discontinued operations	$ 0	$ 17	$ 121