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Financial Instruments - Investment Securities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]          
Equity securities, amortized cost $ 569   $ 569   $ 579
Equity securities, gross unrealized gains 344   344   455
Equity securities, gross unrealized losses (1)   (1)   (1)
Equity securities, estimated fair value 912   912   1,033
Total, amortized cost 629   629   587
Total, gross unrealized gains 344   344   455
Total, gross unrealized losses (8)   (8)   (1)
Total, estimated fair value 965   965   1,041
Net unrealized losses (130) $ (26) (118) $ (813)  
Non-U.S. debt securities          
Debt Securities, Available-for-sale [Line Items]          
Debt securities, amortized cost 60   60   8
Debt securities, gross unrealized gains 0   0   0
Debt securities, gross unrealized losses (7)   (7)   0
Debt securities, estimated fair value 53   53   $ 8
Trading securities $ 46   $ 46    
Debt maturity term 1 year   1 year    
Available for sale securities maturity         1 year
Available-for-sale debt securities $ 7   $ 7