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) - Recurring - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Assets and Liabilities Measured at Fair Value    
Cash equivalents $ 434 $ 231
Debt and equity securities 703 1,195
Financial instrument assets 321 280
Debt 2,664 2,487
Level 1    
Assets and Liabilities Measured at Fair Value    
Cash equivalents 434 231
Debt and equity securities 247 228
Financial instrument assets 23 21
Level 2    
Assets and Liabilities Measured at Fair Value    
Debt and equity securities 456 967
Financial instrument assets 298 259
Debt $ 2,664 $ 2,487