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Other Operating and Non-Operating Income (Notes)	3 Months Ended
Other Operating and Non-Operating Income (Notes)	Mar. 31, 2021
Nonoperating Income (Expense) [Abstract]
Other Operating and Non-Operating Income	OTHER OPERATING AND NON-OPERATING INCOME Other operating credits and charges, net During the three months ended March 31, 2021, we recorded a gain of $1 million related to the sale of assets previously classified as held for sale, offset by other expenses including severance associated with certain reorganizations within the corporate office. During the three months ended March 31, 2020, we recorded a charge of $2 million related to severance associated with certain reorganizations within the corporate office. Other non-operating items During the three months ended March 31, 2021, we recorded an early debt extinguishment charge of $11 million related to the redemption of our 2024 Senior Notes, offset by a foreign currency gain of $1 million. During the three months ended March 31, 2020, we recorded a foreign currency gain of $6 million, offset by $1 million of net periodic pension cost.