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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 | Mar. 31, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial investments, at fair value | $ 220 | $ 245
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial investments, at fair value | 220 | 245
Default fund and margin deposit investments | 2,186 | 1,900
Total | 2,406 | 2,145
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial investments, at fair value | 203 | 228
Default fund and margin deposit investments | 1,610 | 1,763
Total | 1,813 | 1,991
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial investments, at fair value | 17 | 17
Default fund and margin deposit investments | 576 | 137
Total | 593 | 154
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial investments, at fair value | 0 | 0
Default fund and margin deposit investments | 0 | 0
Total | $ 0 | $ 0

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