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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Loss Contingencies [Line Items] |  |  |  |
Legal fees | $ 10 | $ 9 | $ 31 | $ 36
Contractual Obligation | $ 83 |  | $ 83 |
Contractual Obligation, Term of Contract | 5 years |  | 5 years |
Litigation and regulatory matters | Min |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimate of possible loss | $ 8 |  | $ 8 |
Litigation and regulatory matters | Max |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimate of possible loss | $ 15 |  | $ 15 |

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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