Non-Insurance Revenues from Contracts with Customers	3 Months Ended
	Mar. 31, 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 $4.1 billion and $4.0 billion reported in Deferred non-insurance warranty revenue as of March 31, 2021 and December 31, 2020. For the three months ended March 31, 2021 and 2020, the Company recognized $0.3 billion of revenues that were included in the deferred revenue balance as of January 1, 2021 and 2020. For the three months ended March 31, 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 $0.9 billion of the deferred revenue in the remainder of 2021, $1.0 billion in 2022, $0.8 billion in 2023 and $1.3 billion thereafter.