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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash provided by operating activities      
Net income $ 454 $ 532 $ 496
Non-cash charges to net income:      
Depreciation and amortization 247 209 196
Mechanical stores expense 57 57 57
Deferred income taxes (23) 67 (5)
Charge for fair value markup of acquired inventory   9  
Other 39 39 44
Changes in working capital:      
Accounts receivable and prepaid expenses (70) (44) (131)
Inventories (50) (34) (19)
Accounts payable and accrued liabilities (3) (49) 127
Margin accounts 5 6 15
Other 47 (23) (9)
Cash provided by operating activities 703 769 771
Cash used for investing activities      
Capital expenditures and mechanical stores purchases (350) (314) (284)
Payments for acquisitions, net of cash acquired of $ — , $ — , and $4, respectively   (17) (407)
Investment in a non-consolidated affiliate (15)   (2)
Short-term investments 1 (3) 1
Proceeds from disposal of plants and properties 1 8 3
Other 2    
Cash used for investing activities (361) (326) (689)
Cash used for financing activities      
Proceeds from borrowings 987 1,144 1,000
Payments on debt (738) (1,240) (874)
Debt issuance costs     (6)
Repurchases of common stock (657) (123) (8)
Issuances of common stock for share-based compensation, net of settlements 1 9 29
Dividends paid, including to non-controlling interests (182) (165) (141)
Cash used for financing activities (589) (375)  
Effects of foreign exchange rate changes on cash (21) 15 (4)
(Decrease) increase in cash and cash equivalents (268) 83 78
Cash and cash equivalents, beginning of period 595 512  
Cash and cash equivalents, end of period $ 327 $ 595 $ 512