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Fair Value of Financial Instruments (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Assets at Fair Value |  |
Financial investments, at fair value | $ 202 | $ 235
Fair Value, Measurements, Recurring |  |
Assets at Fair Value |  |
Financial investments, at fair value | 202 | 235
Default fund and margin deposit investments | 1,617 | 2,129
Total Assets at Fair Value | 1,819 | 2,364
Liabilities at Fair Value |  |
Other financial instruments | 56 |
Total Liabilities at Fair Value | 56 |
Fair Value, Measurements, Recurring | Level 1 |  |
Assets at Fair Value |  |
Financial investments, at fair value | 148 | 135
Default fund and margin deposit investments | 215 | 371
Total Assets at Fair Value | 363 | 506
Liabilities at Fair Value |  |
Other financial instruments | 0 |
Total Liabilities at Fair Value | 0 |
Fair Value, Measurements, Recurring | Level 2 |  |
Assets at Fair Value |  |
Financial investments, at fair value | 54 | 100
Default fund and margin deposit investments | 1,402 | 1,758
Total Assets at Fair Value | 1,456 | 1,858
Liabilities at Fair Value |  |
Other financial instruments | 56 |
Total Liabilities at Fair Value | 56 |
Fair Value, Measurements, Recurring | Level 3 |  |
Assets at Fair Value |  |
Financial investments, at fair value | 0 | 0
Default fund and margin deposit investments | 0 | 0
Total Assets at Fair Value | 0 | $ 0
Liabilities at Fair Value |  |
Other financial instruments | 0 |
Total Liabilities at Fair Value | $ 0 |

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