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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	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 5,342	$ 4,072
Investments available for sale:
U.S. Treasury securities and obligations of U.S. government corporations and agencies	247	195
Corporate securities	3,146	2,210
Municipal securities	2,187	2,087
Asset-backed securities	683	437
Total investments	7,068	5,532
Restricted deposits available for sale:
Cash and cash equivalents	8	17
Certificates of deposit	433	4
U.S. Treasury securities and obligations of U.S. government corporations and agencies	114	114
Total restricted deposits	555	135
Other long-term assets:
Interest rate swap agreements		1
Total assets at fair value	12,965	9,740
Liabilities
Interest rate swap agreements	95	72
Total liabilities at fair value	95	72
Residential mortgage-backed securities
Investments available for sale:
Mortgage-backed securities	444	332
Commercial mortgage- backed securities
Investments available for sale:
Mortgage-backed securities	361	271
Level I
Assets
Cash and cash equivalents	5,342	4,072
Investments available for sale:
U.S. Treasury securities and obligations of U.S. government corporations and agencies	247	195
Corporate securities	0	0
Municipal securities	0	0
Asset-backed securities	0	0
Total investments	247	195
Restricted deposits available for sale:
Cash and cash equivalents	8	17
Certificates of deposit	0	4
U.S. Treasury securities and obligations of U.S. government corporations and agencies	114	114
Total restricted deposits	122	135
Other long-term assets:
Interest rate swap agreements		0
Total assets at fair value	5,711	4,402
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	3,146	2,210
Municipal securities	2,187	2,087
Asset-backed securities	683	437
Total investments	6,821	5,337
Restricted deposits available for sale:
Cash and cash equivalents	0	0
Certificates of deposit	433	0
U.S. Treasury securities and obligations of U.S. government corporations and agencies	0	0
Total restricted deposits	433	0
Other long-term assets:
Interest rate swap agreements		1
Total assets at fair value	7,254	5,338
Liabilities
Interest rate swap agreements	95	72
Total liabilities at fair value	95	72
Level II | Residential mortgage-backed securities
Investments available for sale:
Mortgage-backed securities	444	332
Level II | Commercial mortgage- backed securities
Investments available for sale:
Mortgage-backed securities	361	271
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
Other long-term assets:
Interest rate swap agreements		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

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This element represents restricted certificates of deposit 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.

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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.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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.

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

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