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Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Predecessor |  |  |  |
Proceeds from Sale of Available-for-sale Securities | $ 161 | $ 626 |  |
Marketable Securities [Member] | Predecessor |  |  |  |
Held-to-maturity Securities |  |  |  | $ 1,362
Marketable Securities [Member] | Successor |  |  |  |
Held-to-maturity Securities |  |  | $ 1,826 |

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