Regulatory Matters - Additional Information (Details) - USD ($)					12 Months Ended
	Jan. 01, 2019	Jan. 02, 2018	Jan. 01, 2017	Jan. 02, 2016	Dec. 31, 2019	Dec. 31, 2015	Jan. 01, 2015
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Common equity Tier 1 capital to risk-weighted assets ratio with minimum for capital adequacy							4.50%
Common equity Tier 1 capital to risk-weighted assets ratio with minimum for prompt corrective action purposes							6.50%
Tier 1 capital to risk-weighted assets ratio with minimum for capital adequacy							4.00%
Increased Tier 1 capital to risk-weighted assets ratio with minimum for capital adequacy							6.00%
Tier 1 capital to risk-weighted assets ratio with minimum for prompt corrective action purposes							6.00%
Increased Tier 1 capital to risk-weighted assets ratio with minimum for prompt corrective action purposes							8.00%
Capital conservation buffer	2.50%				2.50%
Capital conservation buffer annual increase percentage	0.625%	0.625%	0.625%	0.625%
Capital conservation buffer phased-in on pro rata basis period				4 years
Capital conservation buffer phased					2.50%	0.00%
Minimum
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Regulatory assets	$ 3,000,000,000
Required assets to liabilities ratio after dividend effect					125.00%