v3.20.2
Derivative and Financial Instruments - Financial Instruments at fair value (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents $ 2,907 $ 5,088
Short-term Investments 3,985 3,028
Investments and long-term receiavables 8,334 8,687
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 4 99
Short-term Investments 9 191
Investments and long-term receiavables 280 133
Corporate Bonds [Member] | Remaining maturities within one year [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 0 1
Short-term Investments 144 59
Investments and long-term receiavables 0 0
Corporate Bonds [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 0 0
Short-term Investments 0 0
Investments and long-term receiavables 134 99
Commercial Paper [Member] | Remaining maturities within one year [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 4 8
Short-term Investments 126 30
Investments and long-term receiavables 0 0
US Government Debt Securities [Member] | Remaining maturities within one year [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 0 0
Short-term Investments 10 10
Investments and long-term receiavables 0 0
US Government Debt Securities [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 0 0
Short-term Investments 0 0
Investments and long-term receiavables 16 15
U.S. Government Agency Obligations [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 0 0
Short-term Investments 0 0
Investments and long-term receiavables 4 0
Asset-backed Securities [Member] | Remaining Maturities Greater Than One Year Through Five Years [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cash and cash equivalents 0 0
Short-term Investments 0 0
Investments and long-term receiavables $ 37 $ 19