Fair Value Measurements (Recurring Basis Hierarchy Leveling) (Details) - USD ($) $ in Millions |
Sep. 30, 2021 |
Dec. 31, 2020 |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
$ 38,032.9
|
$ 42,022.0
|
Derivative Assets |
3,004.2
|
4,558.2
|
NETTING |
(939.5)
|
(3,507.8)
|
Derivative Assets |
2,064.7
|
1,050.4
|
Derivative Liabilities |
2,756.7
|
4,882.8
|
NETTING |
(2,333.9)
|
(2,817.1)
|
Derivative Liabilities |
422.8
|
2,065.7
|
Cross Product Collateral Adjustment |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
NETTING |
(92.9)
|
(1,867.8)
|
NETTING |
(1,487.3)
|
(1,177.2)
|
U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
2,550.2
|
2,799.9
|
Obligations of States and Political Subdivisions |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
3,750.1
|
3,083.6
|
Government Sponsored Agency |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
18,541.7
|
24,956.7
|
Non-U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
273.4
|
714.0
|
Corporate Debt |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
2,443.8
|
2,539.6
|
Covered Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
559.0
|
553.1
|
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
3,022.7
|
2,345.8
|
Other Asset-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
5,635.0
|
3,997.5
|
Commercial Mortgage-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
1,257.0
|
1,031.8
|
LEVEL 2 |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
35,500.0
|
39,200.0
|
Fair Value, Measurements, Recurring |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
38,032.9
|
42,022.0
|
Trading Account |
0.2
|
0.5
|
Total Available for Sale and Trading Debt Securities |
38,033.1
|
42,022.5
|
Fair Value, Measurements, Recurring | U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
2,550.2
|
2,799.9
|
Fair Value, Measurements, Recurring | Obligations of States and Political Subdivisions |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
3,750.1
|
3,083.6
|
Fair Value, Measurements, Recurring | Government Sponsored Agency |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
18,541.7
|
24,956.7
|
Fair Value, Measurements, Recurring | Non-U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
273.4
|
714.0
|
Fair Value, Measurements, Recurring | Corporate Debt |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
2,443.8
|
2,539.6
|
Fair Value, Measurements, Recurring | Covered Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
559.0
|
553.1
|
Fair Value, Measurements, Recurring | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
3,022.7
|
2,345.8
|
Fair Value, Measurements, Recurring | Other Asset-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
5,635.0
|
3,997.5
|
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
1,257.0
|
1,031.8
|
Fair Value, Measurements, Recurring | Other Assets |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
NETTING |
(939.5)
|
(3,507.8)
|
Derivative Assets |
2,064.7
|
1,050.4
|
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
NETTING |
(936.9)
|
(3,505.3)
|
Derivative Assets |
1,872.5
|
755.4
|
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
NETTING |
(2.6)
|
(2.5)
|
Derivative Assets |
192.2
|
295.0
|
Fair Value, Measurements, Recurring | Other Liabilities |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
NETTING |
(2,333.9)
|
(2,817.1)
|
Derivative Liabilities |
422.8
|
2,065.7
|
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
NETTING |
(2,268.8)
|
(2,718.6)
|
Derivative Liabilities |
343.9
|
2,003.9
|
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
NETTING |
(65.1)
|
(98.5)
|
Derivative Liabilities |
42.2
|
26.5
|
Fair Value, Measurements, Recurring | Other Liabilities | Other Financial Derivatives |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
NETTING |
0.0
|
0.0
|
Derivative Liabilities |
36.7
|
35.3
|
Fair Value, Measurements, Recurring | LEVEL 1 |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
2,550.2
|
2,799.9
|
Trading Account |
0.0
|
0.0
|
Total Available for Sale and Trading Debt Securities |
2,550.2
|
2,799.9
|
Fair Value, Measurements, Recurring | LEVEL 1 | U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
2,550.2
|
2,799.9
|
Fair Value, Measurements, Recurring | LEVEL 1 | Obligations of States and Political Subdivisions |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Government Sponsored Agency |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Non-U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Corporate Debt |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Covered Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Other Asset-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Commercial Mortgage-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Foreign Exchange Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Interest Rate Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Foreign Exchange Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Interest Rate Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Other Financial Derivatives |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 2 |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
35,482.7
|
39,222.1
|
Trading Account |
0.2
|
0.5
|
Total Available for Sale and Trading Debt Securities |
35,482.9
|
39,222.6
|
Fair Value, Measurements, Recurring | LEVEL 2 | U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 2 | Obligations of States and Political Subdivisions |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
3,750.1
|
3,083.6
|
Fair Value, Measurements, Recurring | LEVEL 2 | Government Sponsored Agency |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
18,541.7
|
24,956.7
|
Fair Value, Measurements, Recurring | LEVEL 2 | Non-U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
273.4
|
714.0
|
Fair Value, Measurements, Recurring | LEVEL 2 | Corporate Debt |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
2,443.8
|
2,539.6
|
Fair Value, Measurements, Recurring | LEVEL 2 | Covered Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
559.0
|
553.1
|
Fair Value, Measurements, Recurring | LEVEL 2 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
3,022.7
|
2,345.8
|
Fair Value, Measurements, Recurring | LEVEL 2 | Other Asset-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
5,635.0
|
3,997.5
|
Fair Value, Measurements, Recurring | LEVEL 2 | Commercial Mortgage-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
1,257.0
|
1,031.8
|
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
3,004.2
|
4,558.2
|
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Foreign Exchange Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
2,809.4
|
4,260.7
|
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Interest Rate Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
194.8
|
297.5
|
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
2,720.0
|
4,847.5
|
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Foreign Exchange Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
2,612.7
|
4,722.5
|
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Interest Rate Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
107.3
|
125.0
|
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Other Financial Derivatives |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Trading Account |
0.0
|
0.0
|
Total Available for Sale and Trading Debt Securities |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Obligations of States and Political Subdivisions |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Government Sponsored Agency |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Non-U.S. Government |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Corporate Debt |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Covered Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Other Asset-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Commercial Mortgage-Backed |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Available-for-sale |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Foreign Exchange Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Interest Rate Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Assets |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
36.7
|
35.3
|
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Foreign Exchange Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Interest Rate Contracts |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
0.0
|
0.0
|
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Other Financial Derivatives |
|
|
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
|
Derivative Liabilities |
$ 36.7
|
$ 35.3
|