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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities:    
Net income (loss) $ (97) $ 1,134
Adjustments to reconcile net income (loss) to net cash provided by operations:    
Net change in operating assets and liabilities (805) (592)
Impairment of long-lived assets 489 432
Depreciation and amortization 443 507
Other items 83 (16)
Stock-based compensation 34 30
Deferred income taxes – net and uncertain tax positions (33) (221)
Net gain from sale of long-lived assets and investments (2) (106)
Goodwill impairment   180
Impairment of equity investment   94
Research and development in process   54
Net cash provided by operating activities 112 1,496
Investing activities:    
Beneficial interest collected in exchange for securitized trade receivables 362 444
Purchases of property, plant and equipment (125) (163)
Other investing activities 23 (10)
Proceeds from sales of business, investments and long-lived assets 13 824
Purchases of investments and other assets (1) (56)
Net cash provided by investing activities 272 1,039
Financing activities:    
Repayment of senior notes and loans and other long-term liabilities (126) (6,243)
Tax withholding payments made on shares and dividends (52) (22)
Other financing activities (10) (5)
Net change in short-term debt (1) (261)
Proceeds from senior notes and loans, net of issuance costs   4,440
Net cash used in financing activities (189) (2,091)
Translation adjustment on cash and cash equivalents (4) 11
Net change in cash and cash equivalents 191 455
Balance of cash and cash equivalents at beginning of period 1,782 963
Balance of cash and cash equivalents at end of period 1,973 1,418
Non-cash financing and investing activities:    
Beneficial interest obtained in exchange for securitized trade receivables $ 396 $ 551