Annual report pursuant to Section 13 and 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
Dec. 31, 2020
Dec. 31, 2019
Assets and Liabilities Measured at Fair Value    
Marketable equity securities $ 266 $ 353
Estimate of Fair Value Measurement [Member]    
Assets and Liabilities Measured at Fair Value    
Cash equivalents 2,586 992
Marketable equity securities 266 353
Financial instrument assets 424 532
Debt 4,545 3,678
Financial instrument liabilities 106 53
Level 1    
Assets and Liabilities Measured at Fair Value    
Cash equivalents 2,586 992
Marketable equity securities 181 242
Financial instrument assets 84 63
Level 2    
Assets and Liabilities Measured at Fair Value    
Marketable equity securities 85 111
Financial instrument assets 340 469
Debt 4,545 3,678
Financial instrument liabilities $ 106 $ 53