Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury and other foreign government securities	$ 944	$ 734
Mutual funds	15	16
Total assets at fair value	959	750
Amortization of other intangible assets	4
Short term debt	2,645	1,833
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U.S. Treasury and other foreign government securities	944	734
Mutual funds	15	16
Total assets at fair value	959	750
Restricted Cash And Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value investments recorded	677
Restricted Cash and Investments, Non Current
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value investments recorded	267
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	495	495
Fair value of short term debt	470
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	1,243	1,242
Fair value of short term debt	1,250
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	792	791
Fair value of short term debt	812
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	496	495
Fair value of short term debt	480
2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	1,245	1,244
Fair value of short term debt	1,240
2018 Senior Notes (2.50% senior unsecured notes due October 15, 2018)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of short term debt	599
Short term debt	$ 600	$ 600

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 debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of investments accounted under the equity method.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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