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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 37 $ 20 $ 17
Charged/ (credited) to expense 3 18 7
Charged/(credited) to other accounts (1) 0 0
Deductions from reserves 7 1 4
Balance at end of period 32 37 20
Valuation allowance-taxes      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 42 58 42
Charged/ (credited) to expense 22 (16) 16
Charged/(credited) to other accounts 0 0 0
Deductions from reserves 0 0 0
Balance at end of period $ 64 $ 42 $ 58