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Equity In Net Assets Of Nonconsolidated Affiliates Transactions with NCAs (Details) - Nonconsolidated Affiliates [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transactions [Line Items] |  |  |
Automotive sales and revenue | $ 923 | $ 889 | $ 1,745
Automotive purchases, net | 674 | 803 | 7
Dividends received | 2,000 | 2,120 | 2,047
Operating cash flows | 2,321 | 2,512 | $ 3,853
Accounts and notes receivable, net | 780 | 807 |
Accounts payable | 534 | 553 |
Undistributed earnings | $ 2,184 | $ 2,172 |

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