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Interest Income and Other Non-Operating Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income and Expenses [Abstract]      
Non-service pension and OPEB income $ 1,095 $ 797 $ 1,665
Interest income 241 429 335
Licensing agreements income 211 165 296
Revaluation of investments 265 80 258
Other 73 (2) 42
Total interest income and other non-operating income, net $ 1,885 $ 1,469 $ 2,596