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Other Non-Current Assets (Schedule of Other Non-Current Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Investments, All Other Investments [Abstract]    
Pension assets $ 532 $ 491
Deferred taxes 242 278
Investments 25 20
Debt issuance costs 13 15
Fair value of derivatives 11 54
Other 79 109
Other non-current assets $ 902 $ 967