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
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 295 $ 804
Debt and equity securities 1,362 1,047
Financial instrument assets 524 369
Debt 2,401 2,115
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 295 804
Debt and equity securities 259 467
Financial instrument assets 21 19
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt and equity securities 1,103 580
Financial instrument assets 503 350
Debt $ 2,401 $ 2,115