Non-Insurance Revenues from Contracts with Customers	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Non-Insurance Revenues from Contracts with Customers	Non-Insurance Revenues from Contracts with CustomersThe Company had deferred non-insurance warranty revenue balances of $4.3 billion and $4.0 billion reported in Deferred non-insurance warranty revenue as of June 30, 2021 and December 31, 2020. For the three and six months ended June 30, 2021 and 2020, the Company recognized $0.3 billion and $0.6 billion of revenues that were included in the deferred revenue balance as of January 1, 2021 and 2020. For the three and six months ended June 30, 2021 and 2020, Non-insurance warranty revenue recognized from performance obligations related to prior periods due to a change in estimate was not material. The Company expects to recognize approximately $0.7 billion of the deferred revenue in the remainder of 2021, $1.1 billion in 2022, $0.9 billion in 2023 and $1.6 billion thereafter.