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Equity In Net Assets of Nonconsolidated Affiliates (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity income | $ 530 | $ 500 | $ 1,815 | $ 1,585 |
Equity Method Investee [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Dividends received |  | 382 | 2,000 | 2,000 |
Undistributed earnings | 2,000 |  | 2,000 |  | $ 2,200
Automotive China JVs equity income [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity income | 485 | 459 | $ 1,674 | 1,472 |
Change in ownership percentage |  |  | 0.00% |  |
Equity Method Investment, Summarized Financial Information, Revenue | 11,461 | 12,161 | $ 37,781 | 34,177 |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 999 | 964 | 3,370 | 2,912 |
Other joint ventures equity income [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity income | $ 45 | $ 41 | $ 141 | $ 113 |

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