Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Undistributed earnings of foreign subsidiaries	$ 138,000,000	$ 45,000,000
Valuation allowance	270,000,000	326,000,000
Increase (decrease) to valuation allowance	56,000,000
Unrecognized tax benefits that would impact effective tax rate	37,000,000	33,000,000	$ 35,000,000
Penalties accrued	74,000,000	80,000,000
Deposit to reduce unrecognized tax benefit liabilities	14,000,000	15,000,000
Income tax benefit	(323,000,000)	(111,000,000)	$ (105,000,000)
Estimated tax expense related to tax reform legislation		240,000,000
Tax expense related to tax reform legislation	286,000,000
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Valuation allowance	270,000,000
Affiliated Entity [Member]
Income Taxes [Line Items]
Tax expense due to related party	$ 0	$ 0