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Accounting and Reporting Developments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash used by operating activities | $ (751) | $ (577) |  |
Net cash provided by investing activities | 58 | 153 |  |
Beneficial interests obtained in securitized receivables | 199 | 265 |  |
Cost of products sold | 1,808 | 1,531 |  |
Reclassification of net benefit to pension and other postretirement | $ 17 | 12 |  |
Cumulative effect of change in accounting principle |  |  |  | $ 3
Accounting Standards Update 2016-15 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash used by operating activities |  | 257 |  |
Net cash provided by investing activities |  | 257 |  |
Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cost of products sold |  | (12) |  |
Reclassification of net benefit to pension and other postretirement |  | $ 12 |  |
Retained Earnings | Accounting Standards Update 2017-12 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ (3) |
Accumulated Other Comprehensive Income | Accounting Standards Update 2017-12 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ 3 |

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