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Fair Value (Instruments Not Measured at Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Carrying Amount [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Accounts receivable - noncurrent | $ 76 | $ 100
Liabilities, Fair Value Disclosure [Abstract] |  |
Non-recourse debt | 15,840 | 15,645
Recourse debt | 3,920 | 3,655
Fair Value [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Value added tax | 15 | 16
Accounts receivable - noncurrent | 176 | 209
Liabilities, Fair Value Disclosure [Abstract] |  |
Non-recourse debt | 15,896 | 16,225
Recourse debt | 4,060 | 3,621
Level 1 [Member] | Fair Value [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Accounts receivable - noncurrent | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Non-recourse debt | 0 | 0
Recourse debt | 0 | 0
Level 2 [Member] | Fair Value [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Accounts receivable - noncurrent | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Non-recourse debt | 14,751 | 13,524
Recourse debt | 4,060 | 3,621
Level 3 [Member] | Fair Value [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Accounts receivable - noncurrent | 176 | 209
Liabilities, Fair Value Disclosure [Abstract] |  |
Non-recourse debt | 1,145 | 2,701
Recourse debt | $ 0 | $ 0

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