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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Maturities of Long-Term Debt (Details) - Successor [Member]
$ in Millions
Dec. 31, 2017
USD ($)
[1]
Debt Instrument [Line Items]  
Repayments of Principal 2018 $ 1,286
Repayments of Principal 2019 2,005
Repayments of Principal 2020 3,005
Repayments of Principal 2021 1,505
Repayments of Principal 2022 $ 2
[1] Excludes unamortized debt step-up premium.