Amount of investment in debt security measured at amortized cost (held-to-maturity).

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Financial Instruments Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Predecessor [Member]
Schedule of Held-to-maturity Securities [Line Items]
Proceeds from Sale of Available-for-sale Securities	$ 788
Cash Equivalents [Member] \| Successor [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity		$ 3,551	$ 5,205
Marketable Securities [Member] \| Successor [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity		$ 34	$ 952