Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Long Term Debt (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt payable within one year		$ 268	$ 1,314
Long-term Debt and Capital Lease Obligations		5,812	10,291
Successor [Member]
Debt Instrument [Line Items]
Capital Lease Obligations, Noncurrent		88	4
Unamortized debt discount and issuance costs		2	0
Long-term debt payable within one year	[1]	268	1,314
Loans Payable [Member] | Successor [Member] | Final Maturity 2018
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	$ 0	$ 1,280
Long-term Debt, Weighted Average Interest Rate	[1]	0.00%	1.59%
Loans Payable [Member] | Successor [Member] | Final Maturity 2019
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	$ 263	$ 521
Long-term Debt, Weighted Average Interest Rate	[1]	2.23%	2.23%
Loans Payable [Member] | Successor [Member] | Final Maturity 2020
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	$ 2,496	$ 3,070
Long-term Debt, Weighted Average Interest Rate	[1]	2.14%	1.79%
Loans Payable [Member] | Successor [Member] | Final Maturity 2021
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	$ 475	$ 1,580
Long-term Debt, Weighted Average Interest Rate	[1]	2.08%	2.07%
Loans Payable [Member] | Successor [Member] | Final Maturity 2023
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	$ 386	$ 1,269
Long-term Debt, Weighted Average Interest Rate	[1]	2.48%	2.48%
Loans Payable [Member] | Successor [Member] | Final Maturity 2024 and thereafter
Debt Instrument [Line Items]
Long-term Debt, Gross	[1]	$ 249	$ 2,223
Long-term Debt, Weighted Average Interest Rate	[1]	3.69%	3.80%
Loans Payable [Member] | Successor [Member] | Term Loan Facility due 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	[2]		$ 1,500
Long-term Debt, Weighted Average Interest Rate	[2]		2.35%
Loans Payable [Member] | Successor [Member] | Term Loan Facility due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	[2]	$ 2,000
Long-term Debt, Weighted Average Interest Rate	[2]	3.46%
Loans Payable [Member] | Successor [Member] | Other Loans [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 15	$ 18
Long-term Debt, Weighted Average Interest Rate		4.32%	4.32%
Loans Payable [Member] | Successor [Member] | Foreign Currency Loans [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 0	$ 30
Long-term Debt, Weighted Average Interest Rate		0.00%	2.85%
Medium-term Notes [Member] | Successor [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 110	$ 110
Long-term Debt, Weighted Average Interest Rate		2.37%	1.22%
Fair Value, Inputs, Level 2 [Member] | Successor [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value		$ 5,800	$ 10,250

[1] See discussion of debt extinguishment that follows.

[2] The Term Loan Facility was amended in 2018 to extend the maturity date to June 2020.