Business, Basis of Presentation and Significant Accounting Policies (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 31, 2017 segment $ / shares shares
Item Effected [Line Items]
Number of operating segments | segment		1
Rate required of collateral as a percent of market value of loans securities		102.00%
ING International
Item Effected [Line Items]
Warrant exercise price (in usd per share) | $ / shares		$ 48.75
Number of warrants held for purchase | shares		26,050,846
Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax | $	$ 70