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Income Taxes - Reconciliation of Statutory Tax Rate to Effective Tax Rate (Details) - USD ($) $ in Millions			12 Months Ended
		Dec. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 21, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate		21.00%	21.00%	35.00%	35.00%	35.00%
Nondeductible expenses			(3.70%)	(104.00%)		(19.00%)
Effect of tax law changes			0.50%	1282.40%		0.00%
Change in valuation allowance for deferred tax assets			(1.70%)	(39.50%)		0.10%
State taxes, net of federal benefit			(2.30%)	1.20%		1.80%
Audit and other tax return adjustments			0.00%	0.00%		1.40%
Tax-exempt income, credits and incentives			2.20%	38.90%		0.70%
Foreign rate differential adjusted for U.S. taxation of foreign profits	[1]		1.90%	47.70%		0.70%
Divestitures	[1]		20.30%	51.90%		0.00%
Unrecognized tax benefits and other			(2.90%)	(3.50%)		(0.80%)
Effective Income Tax Rate			(5.30%)	1206.30%		19.90%
Income taxes paid			$ 108	$ 29		$ (123)
[1] The “U.S. taxation of foreign profits” represents the U.S. tax, net of foreign tax credits, associated with actual and deemed repatriations of earnings from our non-U.S. subsidiaries.

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Effective income tax rate reconciliation, effect of tax law changes, percent - Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax laws.

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