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Stock-Based Compensation	9 Months Ended
Stock-Based Compensation	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation We issue stock-based incentive awards to our eligible employees under the 2019 Stock Incentive Plan ("2019 Plan") and to our eligible non-employee Directors under a Director Deferred Stock Ownership Plan. The 2019 Plan permits the granting of incentive stock options, nonqualified stock options, stock appreciation rights, performance stock, restricted stock and other stock-based awards. Total stock-based compensation expense primarily related to restricted stock and unit awards was $40 million and $90 million for the three and nine months ended September 30, 2021, respectively, and $38 million and $60 million, for the three and nine months ended September 30, 2020, respectively. Total unrecognized compensation expense related to unvested restricted stock and unit awards as of September 30, 2021 was $122 million, which is expected to be recognized over a weighted average period of 1.8 years.