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Schedule II - Valuation and Qualifying Accounts [Schedule] Valuation and Qualifying Accounts [Details] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Allowance for Doubtful Accounts and Other Customer Financing Activity [Member] |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance December 31 | $ 467 | $ 553 | $ 494 | $ 538
Provision charged to income | 64 | 137 | 93 |
Doubtful accounts written off (net) | 105 | 59 | 91 |
Other adjustments | (45) | (19) | (46) |
Future Income Tax Benefits - Valuation Allowance [Member] |  |  |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance December 31 | 545 | 591 | 612 | $ 942
Other adjustments | (17) | (29) | (366) |
Additions charged to income tax expense | 32 | 42 | 91 |
Reductions credited to income tax expense | $ 61 | 41 | $ 55 |
Additions charged to goodwill, due to acquisitions |  | $ 7 |  |

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