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Leases - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases
Retained earnings	$ 2,802	$ 2,672
ASC 842
Leases
Retained earnings				$ 2
ASC 842 | Retained earnings
Leases
Retained earnings				$ 2
Minimum | ASC 842 | Retained earnings
Leases
Retained earnings			$ 0

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[Line Items] for Leases [Table]

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No definition available.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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