Regulatory Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2018

Regulatory Capital Requirements [Abstract]

Summary of Capital Amounts and Ratios

The Company's and the Bank's capital amounts and ratios are presented in the following tables.

	U.S. Basel III					Minimum Capital Requirement with Capital Conservation Buffer (1)
(Dollars in millions)	Amount		Ratio			Amount		Ratio
Capital Ratios for the Company:
As of December 31, 2018:
Common equity tier 1 capital (to risk-weighted assets)	$	14,256	13.96	%	≥	$	6,508	6.375	%
Tier 1 capital (to risk-weighted assets)	14,256		13.96		≥	8,039		7.875
Total capital (to risk-weighted assets)	14,904		14.60		≥	10,081		9.875
Tier 1 leverage(2)	14,256		8.77		≥	6,502		4.000
As of December 31, 2017:
Common equity tier 1 capital (to risk-weighted assets)	$	15,708	16.31	%	≥	$	5,539	5.750	%
Tier 1 capital (to risk-weighted assets)	15,708		16.31		≥	6,984		7.250
Total capital (to risk-weighted assets)	17,106		17.76		≥	8,910		9.250
Tier 1 leverage(2)	15,708		10.06		≥	6,245		4.000

(1) Beginning January 1, 2018, the minimum capital requirement includes a capital conservation buffer of 1.875%.

(2) Tier 1 capital divided by quarterly average assets (excluding certain disallowed assets, primarily goodwill and other intangibles).

	U.S. Basel III					Minimum Capital Requirement with Capital Conservation Buffer (1)					To Be Well-Capitalized Under Prompt Corrective Action Provisions
(Dollars in millions)	Amount		Ratio			Amount		Ratio			Amount		Ratio
Capital Ratios for the Bank:
As of December 31, 2018 (U.S. Basel III):
Common equity tier 1 capital (to risk-weighted assets)	$	13,316	14.45	%	≥	$	5,876	6.375	%	≥	$	5,991	6.5	%
Tier 1 capital (to risk-weighted assets)	13,316		14.45		≥	7,258		7.875		≥	7,374		8.0
Total capital (to risk-weighted assets)	13,905		15.09		≥	9,102		9.875		≥	9,217		10.0
Tier 1 leverage(2)	13,316		10.61		≥	5,018		4.000		≥	6,273		5.0
As of December 31, 2017 (U.S. Basel III):
Common equity tier 1 capital (to risk-weighted assets)	$	14,028	16.17	%	≥	$	4,987	5.750	%	≥	$	5,637	6.5	%
Tier 1 capital (to risk-weighted assets)	14,028		16.17		≥	6,288		7.250		≥	6,938		8.0
Total capital (to risk-weighted assets)	15,335		17.68		≥	8,023		9.250		≥	8,673		10.0
Tier 1 leverage(2)	14,028		11.78		≥	4,762		4.000		≥	5,953		5.0

(1) Beginning January 1, 2018, the minimum capital requirement includes a capital conservation buffer of 1.875%.

(2) Tier 1 capital divided by quarterly average assets (excluding certain disallowed assets, primarily goodwill and other intangibles).