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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities      
Net earnings (loss) $ 836 $ 479 $ 573
Adjustments to reconcile to net cash provided by (used in) operating activities      
Depreciation 167 165 163
Amortization of purchased intangibles 36 40 23
Amortization of debt issuance costs 4 6 5
Provision for doubtful accounts (4) 10  
Stock-based compensation 36 34 36
Deferred income taxes 10 184 85
Loss on early extinguishment of debt   22  
Change in      
Accounts receivable 195 (126) (16)
Contract assets (242) 91 (6)
Inventoried costs 40 18 75
Prepaid expenses and other assets (40) (52) (17)
Accounts payable and accruals 335 102 (41)
Retiree benefits (454) (163) (44)
Other non-cash transactions, net (5) 4 (14)
Net cash provided by (used in) operating activities 914 814 822
Capital expenditures      
Capital expenditure additions (463) (382) (285)
Grant proceeds for capital expenditures 61 21  
Acquisitions of businesses, net of cash received (77) 3 (372)
Investment in affiliates (10)    
Proceeds from disposition of assets 13 9 4
Net cash provided by (used in) investing activities (476) (349) (653)
Financing Activities      
Proceeds from issuance of long-term debt 600  
Repayment of long-term debt   (600)  
Proceeds from line of credit borrowings 95    
Repayment of line of credit borrowings (95)    
Debt issuance costs   (12)  
Premiums and fees related to early extinguishment of debt   (15)  
Dividends paid (132) (115) (98)
Repurchases of common stock (742) (286) (194)
Employee taxes on certain share-based payment arrangements (25) (56) (51)
Net cash provided by (used in) financing activities (899) (484) (343)
Change in cash and cash equivalents (461) (19) (174)
Cash and cash equivalents, beginning of period 701 720 894
Cash and cash equivalents, end of period 240 701 720
Supplemental Cash Flow Disclosure      
Cash paid for income taxes 142 223 229
Cash paid for interest 62 72 71
Non-Cash Investing and Financing Activities      
Capital expenditures accrued in accounts payable 55 33 24
Accrued repurchases of common stock $ 48 $ 2  
Capital assets received from government grants     $ 30