Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Details)

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Assets And Liabilities Measured At Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 824 $ 804
Debt and equity securities 1,502 1,047
Financial instrument assets 416 369
Debt 2,482 2,115
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 824 804
Debt and equity securities 471 467
Financial instrument assets 21 19
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt and equity securities 1,031 580
Financial instrument assets 395 350
Debt $ 2,482 $ 2,115