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Interest Cost Components
 12 Months Ended
Dec. 31, 2021
Interest Cost Components [Abstract]  
Interest Cost Disclosure Interest Cost Components
For the year ended December 31,202120202019
Amount charged to expense$100 $118 $115 
Amount capitalized4 6 12 
$104 $124 $127 
In 2020 (January through March) and 2019, total interest costs include an allocation of ParentCo’s financing costs of $28 and $115, respectively (see Cost Allocations in Note A). Also, in 2020, total interest costs include $19 for the write-off and immediate expensing of certain debt issuance costs related to a debt refinancing (see Note Q). Typically, such costs are deferred and amortized to interest expense over the term of the related financing arrangement.