Annual report pursuant to Section 13 and 15(d)

Assets And Liabilities Measured At Fair Value (Details)

v3.8.0.1
Assets And Liabilities Measured At Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 804 $ 289
Available-for-sale securities 1,047 489
Financial instrument assets 369 286
Debt 2,115 1,546
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 804 289
Available-for-sale securities 467 489
Financial instrument assets 19 16
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 580  
Financial instrument assets 350 270
Debt $ 2,115 $ 1,546