CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities:
Net income (loss)		$ 693	$ 724	$ (225)
Less: Loss (income) from discontinued operations, net of tax		76	(91)	732
Income from continuing operations		769	633	507
Depreciation of property, plant and equipment		172	156	161
Amortization of intangibles and other assets		53	42	42
Deferred income tax (benefit) provision		(8)	27	18
Stock-based employee compensation expense		53	49	46
Contributions to employee savings plans in L3's common stock		106	102	98
Goodwill impairment charges	[1]	0	0	46
Amortization of pension and postretirement benefit plans net loss and prior service cost		59	48	67
Amortization of bond discounts and deferred debt issue costs (included in interest expense)		6	8	8
Gain on sale of property, plant and equipment		(31)	(5)	0
Loss related to business divestitures	[2]	0	0	31
Other non-cash items		9	17	(3)
Changes in operating assets and liabilities, excluding amounts from acquisitions, divestitures, and discontinued operations:
Billed receivables		(18)	1	61
Contracts in process		(70)	26	6
Inventories		(69)	22	(38)
Other assets		(13)	29	(27)
Accounts payable, trade		99	(5)	(27)
Accrued employment costs		28	10	35
Accrued expenses		32	(6)	23
Advance payments and billings in excess of costs incurred		13	(73)	(7)
Income taxes		(39)	33	(9)
Other current liabilities		(42)	(20)	3
Pension and postretirement benefits		(48)	(57)	(8)
All other operating activities		(76)	(15)	2
Net cash from operating activities from continuing operations		985	1,022	1,035
Investing activities:
Business acquisitions, net of cash acquired		(316)	(388)	(320)
Proceeds from the sale of businesses, net of closing date cash balances		18	561	318
Capital expenditures		(224)	(210)	(195)
Dispositions of property, plant and equipment		74	21	3
Other investing activities		(5)	6	4
Net cash used in investing activities from continuing operations		(453)	(10)	(190)
Financing activities:
Proceeds from sale of senior notes		0	547	0
Repurchases, redemptions and maturities of senior notes		0	(856)	(297)
Borrowings under revolving credit facility		1,328	819	1,194
Repayments of borrowings under revolving credit facility		(1,328)	(819)	(1,194)
Common stock repurchased		(180)	(373)	(740)
Dividends paid		(236)	(220)	(214)
Proceeds from exercise of stock options		46	53	48
Proceeds from employee stock purchase plan		32	31	34
Debt issue costs		0	(10)	0
Repurchases of common stock to satisfy tax withholding obligations		(18)	(21)	(33)
Other financing activities		(10)	(7)	(3)
Net cash used in financing activities from continuing operations		(366)	(856)	(1,205)
Effect of foreign currency exchange rate changes on cash and cash equivalents		20	(13)	(19)
Net cash from (used in) discontinued operations:
Operating activities		117	19	90
Investing activities		(4)	(6)	(7)
Net cash from discontinued operations		113	13	83
Change in cash balance in assets held for sale		0	0	61
Net increase (decrease) in cash and cash equivalents		299	156	(235)
Cash and cash equivalents, beginning of the year		363	207	442
Cash and cash equivalents, end of the year		$ 662	$ 363	$ 207

[1] Represents non-cash goodwill impairment charges recorded during 2015 of $46 million related to a business retained by L3 in connection with the sale of the NSS segment.

[2] See Note 3 for information regarding the Company's business divestitures.