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Fair Value Measurements - Fair Value Measurements by Level for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 6,345 | $ 5,342
Investments available for sale: |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 149 | 247
Corporate securities | 3,342 | 3,146
Municipal securities | 2,290 | 2,187
Asset-backed securities | 728 | 683
Total investments | 7,344 | 7,068
Restricted deposits available for sale: |  |
Cash and cash equivalents | 6 | 8
Certificates of deposit | 474 | 433
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 102 | 114
Total restricted deposits | 582 | 555
Total assets at fair value | 14,271 | 12,965
Liabilities |  |
Interest rate swap agreements | 61 | 95
Total liabilities at fair value | 61 | 95
Residential mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 455 | 444
Commercial mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 380 | 361
Level I |  |
Assets |  |
Cash and cash equivalents | 6,345 | 5,342
Investments available for sale: |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 149 | 247
Corporate securities | 0 | 0
Municipal securities | 0 | 0
Asset-backed securities | 0 | 0
Total investments | 149 | 247
Restricted deposits available for sale: |  |
Cash and cash equivalents | 6 | 8
Certificates of deposit | 0 | 0
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 102 | 114
Total restricted deposits | 108 | 122
Total assets at fair value | 6,602 | 5,711
Liabilities |  |
Interest rate swap agreements | 0 | 0
Total liabilities at fair value | 0 | 0
Level I | Residential mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 0 | 0
Level I | Commercial mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 0 | 0
Level II |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Investments available for sale: |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 0 | 0
Corporate securities | 3,342 | 3,146
Municipal securities | 2,290 | 2,187
Asset-backed securities | 728 | 683
Total investments | 7,195 | 6,821
Restricted deposits available for sale: |  |
Cash and cash equivalents | 0 | 0
Certificates of deposit | 474 | 433
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 0 | 0
Total restricted deposits | 474 | 433
Total assets at fair value | 7,669 | 7,254
Liabilities |  |
Interest rate swap agreements | 61 | 95
Total liabilities at fair value | 61 | 95
Level II | Residential mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 455 | 444
Level II | Commercial mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 380 | 361
Level III |  |
Assets |  |
Cash and cash equivalents | 0 | 0
Investments available for sale: |  |
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 0 | 0
Corporate securities | 0 | 0
Municipal securities | 0 | 0
Asset-backed securities | 0 | 0
Total investments | 0 | 0
Restricted deposits available for sale: |  |
Cash and cash equivalents | 0 | 0
Certificates of deposit | 0 | 0
U.S. Treasury securities and obligations of U.S. government corporations and agencies | 0 | 0
Total restricted deposits | 0 | 0
Total assets at fair value | 0 | 0
Liabilities |  |
Interest rate swap agreements | 0 | 0
Total liabilities at fair value | 0 | 0
Level III | Residential mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | 0 | 0
Level III | Commercial mortgage-backed securities |  |
Investments available for sale: |  |
Mortgage-backed securities | $ 0 | $ 0

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- Definition This element represents asset backed securities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition This element represents restricted cash and cash equivalents reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition This element represents total restricted deposits reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References No definition available. + Details
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