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Equity In Net Assets Of Nonconsolidated Affiliates Summarized Financial Data of NCAs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | $ 30,854 | $ 25,708 |
Non-current assets | 17,597 | 18,703 |
Total assets | 48,451 | 44,411 |
Current liabilities | 34,897 | 28,705 |
Non-current liabilities | 3,542 | 5,291 |
Total liabilities | 38,439 | 33,996 |
Noncontrolling interests | 872 | 857 |
Net sales | 52,607 | 49,562 | $ 48,530
Net Income | 4,632 | 4,495 | 4,725
Automotive China JVs [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | 17,370 | 17,325 |
Non-current assets | 14,188 | 12,712 |
Total assets | 31,558 | 30,037 |
Current liabilities | 22,642 | 21,428 |
Non-current liabilities | 1,639 | 1,393 |
Total liabilities | 24,281 | 22,821 |
Noncontrolling interests | 871 | 856 |
Net sales | 50,065 | 47,150 | 44,959
Net Income | 3,984 | 4,117 | 4,290
Other joint ventures [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets | 13,484 | 8,383 |
Non-current assets | 3,409 | 5,991 |
Total assets | 16,893 | 14,374 |
Current liabilities | 12,255 | 7,277 |
Non-current liabilities | 1,903 | 3,898 |
Total liabilities | 14,158 | 11,175 |
Noncontrolling interests | 1 | 1 |
Net sales | 2,542 | 2,412 | 3,571
Net Income | $ 648 | $ 378 | $ 435

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