Stock Based Awards and Other Equity Instruments - Summary of Activity for MSUs (Details) - MSUs $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares
MSUs outstanding
Unvested outstanding, Beginning balance | shares	174
Unvested outstanding, Ending balance | shares	174
Weighted Average Grant-Date Fair Value Per Share
Unvested outstanding, Weighted Average Grant-Date Fair Value Per Share, Beginning balance | $ / shares	$ 37.29
Unvested outstanding, Weighted Average Grant-Date Fair Value Per Share, Ending balance | $ / shares	$ 37.29
Aggregate Intrinsic Value
Unvested RSUs outstanding, Aggregate Intrinsic Value | $	$ 7
Unvested MSUs outstanding, Aggregate Intrinsic Value | $	$ 7