Fair Value Measurement - Recurring Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Other assets | | $ 2,065 | $ 2,461 |
Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Other assets | [1],[2] | 29 | 28 |
Total | [1] | 5,535 | 6,090 |
Business Combination, Contingent Consideration, Liability | [1] | 25 | 26 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | [1] | 25 | 26 |
Fair Value, Measurements, Recurring | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Other assets | [2] | 15 | 15 |
Total | | 15 | 15 |
Business Combination, Contingent Consideration, Liability | | 0 | 0 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Other assets | [2] | 0 | 0 |
Total | | 5,457 | 6,012 |
Business Combination, Contingent Consideration, Liability | | 0 | 0 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Other assets | [2] | 14 | 13 |
Total | | 63 | 63 |
Business Combination, Contingent Consideration, Liability | | 25 | 26 |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | | 25 | 26 |
U.S. Government and Federal Agency | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 2,285 | 2,888 |
U.S. Government and Federal Agency | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | [1] | 2,285 | 2,888 |
U.S. Government and Federal Agency | Fair Value, Measurements, Recurring | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
U.S. Government and Federal Agency | Fair Value, Measurements, Recurring | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 2,285 | 2,888 |
U.S. Government and Federal Agency | Fair Value, Measurements, Recurring | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
State and municipal | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 47 | 48 |
State and municipal | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | [1] | 47 | 48 |
State and municipal | Fair Value, Measurements, Recurring | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
State and municipal | Fair Value, Measurements, Recurring | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
State and municipal | Fair Value, Measurements, Recurring | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 47 | 48 |
Residential mortgage-backed | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | [3] | 1,123 | 1,139 |
Residential mortgage-backed | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | [1] | 1,123 | 1,139 |
Residential mortgage-backed | Fair Value, Measurements, Recurring | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
Residential mortgage-backed | Fair Value, Measurements, Recurring | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 1,123 | 1,139 |
Residential mortgage-backed | Fair Value, Measurements, Recurring | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
Asset-backed Securities [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | [4] | 2,049 | 1,985 |
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | [1] | 2,049 | 1,985 |
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 2,049 | 1,985 |
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
Debt Security, Corporate, US [Member] | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 2 | 2 |
Debt Security, Corporate, US [Member] | Fair Value, Measurements, Recurring | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | [1] | 2 | 2 |
Debt Security, Corporate, US [Member] | Fair Value, Measurements, Recurring | Level 1 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
Debt Security, Corporate, US [Member] | Fair Value, Measurements, Recurring | Level 2 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | 0 | 0 |
Debt Security, Corporate, US [Member] | Fair Value, Measurements, Recurring | Level 3 | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | |
Debt securities | | $ 2 | $ 2 |
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[1] | For the three months ended March 31, 2019, there were no fair value measurements transferred between levels. | |
[2] | Other assets primarily relate to equity investments measured at fair value. | |
[3] | All of our residential mortgage-backed securities have been issued by government-sponsored entities and are collateralized by U.S. mortgages. At March 31, 2019 and December 31, 2018, $307 million and $313 million of residential mortgage-backed securities, respectively, are pledged by the Bank as collateral to the Federal Reserve to secure Federal Reserve Discount Window advances. | |
[4] | All of our asset-backed securities are collateralized by credit card loans. | |