Business and Basis of Presentation (Details) $ in Millions			12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 22, 2017 USD ($)	Dec. 31, 2017 USD ($) segment Company
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of holding companies having outstanding public debt | Company			2
Number of reportable segments | segment			1
Item Effected [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)			$ 61
Accumulated Other Comprehensive Income [Member]
Item Effected [Line Items]
Reclassification of stranded tax effects (see Note 1)		$ 56	56
United States [Member]
Item Effected [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)			$ 61
Accounting Standards Update 2016-01 [Member] | Subsequent Event [Member]
Item Effected [Line Items]
Cumulative changes in fair value of FG VIE Liabilities, net of tax	$ 32