Fair Value Measurement - Level 3 Inputs (Details) $ in Millions	Dec. 31, 2018 USD ($) $ / shares $ / bbl	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans	$ 3,151	$ 2,508
Asset-backed securities	230,394	201,678
MSRs	$ 6,130	6,030	$ 6,096	$ 6,608
Assumed par value for price input (in dollars per share) | $ / shares	$ 100
Obligations of U.S. states and municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	$ 37,723	32,338
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	1,918	2,757
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	26,697
Commercial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	6,654	5,025
Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans	3,151	2,508
Asset-backed securities	230,394
MSRs	6,130	6,030
Long-term debt, short-term borrowings, and deposits	234,238	211,644
Recurring | Obligations of U.S. states and municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	37,723
Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	1,918
Recurring | Mortgage-backed securities, U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	68,646
Recurring | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	8,520
Recurring | Commercial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	6,654
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans	122	276
Asset-backed securities	1
MSRs	6,130	6,030
Long-term debt, short-term borrowings, and deposits	34,784	$ 32,271
Other level 3 assets and liabilities, net	326
Recurring | Level 3 | Obligations of U.S. states and municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	0
Recurring | Level 3 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	0
Recurring | Level 3 | Mortgage-backed securities, U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	0
Recurring | Level 3 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	1
Recurring | Level 3 | Commercial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities	0
Discounted cash flows | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
MSRs	6,130
Other assets	306
Discounted cash flows | Recurring | Level 3 | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	858
Discounted cash flows | Recurring | Level 3 | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans	234
Discounted cash flows | Recurring | Level 3 | Loans | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	252
Discounted cash flows | Recurring | Level 3 | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability)	142
Discounted cash flows | Recurring | Level 3 | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability)	(163)
Discounted cash flows | Recurring | Level 3 | Net foreign exchange derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability)	(175)
Discounted cash flows | Recurring | Level 3 | Mortgage-backed securities, U.S. government agencies | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	541
Discounted cash flows | Recurring | Level 3 | Residential mortgage-backed securities | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	65
Market comparables | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets	922
Market comparables | Recurring | Level 3 | Commercial mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	419
Market comparables | Recurring | Level 3 | Obligations of U.S. states and municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading	689
Market comparables | Recurring | Level 3 | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading	334
Market comparables | Recurring | Level 3 | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans	942
Market comparables | Recurring | Level 3 | Loans | Commercial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	278
Market comparables | Recurring | Level 3 | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading	127
Market comparables | Recurring | Level 3 | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability)	56
Market comparables | Recurring | Level 3 | Mortgage-backed securities, U.S. government agencies | Commercial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	8
Market comparables | Recurring | Level 3 | Commercial | Commercial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	11
Market comparables | Recurring | Level 3 | Nontrading loans | Commercial
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans	122
Option pricing | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits	25,110
Option pricing | Recurring | Level 3 | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability)	(180)
Option pricing | Recurring | Level 3 | Net foreign exchange derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability)	(122)
Option pricing | Recurring | Level 3 | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability)	(2,225)
Option pricing | Recurring | Level 3 | Net commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability)	$ (1,129)
Yield | Discounted cash flows | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	0.08
Yield | Discounted cash flows | Level 3 | Minimum | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0
Yield | Discounted cash flows | Level 3 | Minimum | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans, measurement input	0.08
Yield | Discounted cash flows | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	0.10
Yield | Discounted cash flows | Level 3 | Maximum | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0.19
Yield | Discounted cash flows | Level 3 | Maximum | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans, measurement input	0.08
Yield | Discounted cash flows | Level 3 | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	0.08
Yield | Discounted cash flows | Level 3 | Weighted Average | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0.06
Yield | Discounted cash flows | Level 3 | Weighted Average | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans, measurement input	0.08
Prepayment speed | Discounted cash flows | Level 3 | Minimum | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0
Prepayment speed | Discounted cash flows | Level 3 | Minimum | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.04
Prepayment speed | Discounted cash flows | Level 3 | Minimum | Net foreign exchange derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.08
Prepayment speed | Discounted cash flows | Level 3 | Maximum | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0.24
Prepayment speed | Discounted cash flows | Level 3 | Maximum | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.30
Prepayment speed | Discounted cash flows | Level 3 | Maximum | Net foreign exchange derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.09
Prepayment speed | Discounted cash flows | Level 3 | Weighted Average | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0.09
Conditional default rate | Discounted cash flows | Level 3 | Minimum | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0
Conditional default rate | Discounted cash flows | Level 3 | Minimum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.03
Conditional default rate | Discounted cash flows | Level 3 | Maximum | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0.09
Conditional default rate | Discounted cash flows | Level 3 | Maximum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.72
Conditional default rate | Discounted cash flows | Level 3 | Weighted Average | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0.01
Loss severity | Discounted cash flows | Level 3 | Minimum | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0
Loss severity | Discounted cash flows | Level 3 | Minimum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	1
Loss severity | Discounted cash flows | Level 3 | Maximum | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	1
Loss severity | Discounted cash flows | Level 3 | Maximum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	1.00
Loss severity | Discounted cash flows | Level 3 | Weighted Average | Residential mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input	0.06
Price | Market comparables | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs | $ / shares	20
Price | Market comparables | Level 3 | Minimum | Commercial mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input | $ / shares	0
Price | Market comparables | Level 3 | Minimum | Obligations of U.S. states and municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading, measurement input | $ / shares	62
Price | Market comparables | Level 3 | Minimum | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading, measurement input | $ / shares	0
Price | Market comparables | Level 3 | Minimum | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans, measurement input | $ / shares	2
Price | Market comparables | Level 3 | Minimum | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities, measurement inputs | $ / shares	1
Price | Market comparables | Level 3 | Minimum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	1
Price | Market comparables | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs | $ / shares	108
Price | Market comparables | Level 3 | Maximum | Commercial mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input | $ / shares	103
Price | Market comparables | Level 3 | Maximum | Obligations of U.S. states and municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading, measurement input | $ / shares	100
Price | Market comparables | Level 3 | Maximum | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading, measurement input | $ / shares	107
Price | Market comparables | Level 3 | Maximum | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans, measurement input | $ / shares	101
Price | Market comparables | Level 3 | Maximum | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities, measurement inputs | $ / shares	102
Price | Market comparables | Level 3 | Maximum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	115
Price | Market comparables | Level 3 | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs | $ / shares	40
Price | Market comparables | Level 3 | Weighted Average | Commercial mortgage-backed securities and loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities and loans, measurement input | $ / shares	90
Price | Market comparables | Level 3 | Weighted Average | Obligations of U.S. states and municipalities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading, measurement input | $ / shares	96
Price | Market comparables | Level 3 | Weighted Average | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt securities, trading, measurement input | $ / shares	57
Price | Market comparables | Level 3 | Weighted Average | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans, measurement input | $ / shares	78
Price | Market comparables | Level 3 | Weighted Average | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Asset-backed securities, measurement inputs | $ / shares	67
Interest rate spread volatility | Option pricing | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.0016
Interest rate spread volatility | Option pricing | Level 3 | Minimum | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.0016
Interest rate spread volatility | Option pricing | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.0038
Interest rate spread volatility | Option pricing | Level 3 | Maximum | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.0038
Interest rate correlation | Option pricing | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	(0.45)
Interest rate correlation | Option pricing | Level 3 | Minimum | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	(0.45)
Interest rate correlation | Option pricing | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.97
Interest rate correlation | Option pricing | Level 3 | Maximum | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.97
IR-FX correlation | Option pricing | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	(0.45)
IR-FX correlation | Option pricing | Level 3 | Minimum | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.45
IR-FX correlation | Option pricing | Level 3 | Minimum | Net foreign exchange derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	(0.45)
IR-FX correlation | Option pricing | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.60
IR-FX correlation | Option pricing | Level 3 | Maximum | Net interest rate derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.60
IR-FX correlation | Option pricing | Level 3 | Maximum | Net foreign exchange derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.60
Credit correlation | Discounted cash flows | Level 3 | Minimum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.25
Credit correlation | Discounted cash flows | Level 3 | Maximum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.55
Credit spread | Discounted cash flows | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	0.0055
Credit spread | Discounted cash flows | Level 3 | Minimum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.0010
Credit spread | Discounted cash flows | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	0.0055
Credit spread | Discounted cash flows | Level 3 | Maximum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.1487
Credit spread | Discounted cash flows | Level 3 | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	0.0055
Recovery rate | Discounted cash flows | Level 3 | Minimum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.20
Recovery rate | Discounted cash flows | Level 3 | Maximum | Net credit derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.70
Equity volatility | Option pricing | Level 3 | Minimum | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.14
Equity volatility | Option pricing | Level 3 | Maximum | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.57
Equity correlation | Option pricing | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.20
Equity correlation | Option pricing | Level 3 | Minimum | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.20
Equity correlation | Option pricing | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.98
Equity correlation | Option pricing | Level 3 | Maximum | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.98
Equity-FX correlation | Option pricing | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	(0.75)
Equity-FX correlation | Option pricing | Level 3 | Minimum | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	(0.75)
Equity-FX correlation | Option pricing | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.61
Equity-FX correlation | Option pricing | Level 3 | Maximum | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.61
Equity-IR correlation | Option pricing | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.20
Equity-IR correlation | Option pricing | Level 3 | Minimum | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.20
Equity-IR correlation | Option pricing | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Long-term debt, short-term borrowings, and deposits, measurement inputs	0.60
Equity-IR correlation | Option pricing | Level 3 | Maximum | Net equity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.60
Forward commodity price | Option pricing | Level 3 | Minimum | Net commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs | $ / bbl	39
Forward commodity price | Option pricing | Level 3 | Maximum | Net commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs | $ / bbl	56
Commodity volatility | Option pricing | Level 3 | Minimum | Net commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.05
Commodity volatility | Option pricing | Level 3 | Maximum | Net commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.68
Commodity correlation | Option pricing | Level 3 | Minimum | Net commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	(0.51)
Commodity correlation | Option pricing | Level 3 | Maximum | Net commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net derivative asset (liability), measurement inputs	0.95
EBITDA multiple | Market comparables | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	2.9
EBITDA multiple | Market comparables | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	8.3
EBITDA multiple | Market comparables | Level 3 | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets, measurement inputs	7.5