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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% |  |

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