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Non-Insurance Revenues from Contracts with Customers	9 Months Ended
Non-Insurance Revenues from Contracts with Customers	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Non-Insurance Revenues from Contracts with Customers	Non-Insurance Revenues from Contracts with Customers The Company had deferred non-insurance warranty revenue balances of $3.7 billion and $3.4 billion reported in Deferred non-insurance warranty revenue as of September 30, 2019 and December 31, 2018. For the three and nine months ended September 30, 2019, the Company recognized $236 million and $747 million of revenues that were included in the deferred revenue balance as of January 1, 2019. For the three and nine months ended September 30, 2018, the Company recognized $200 million and $635 million of revenues that were included in the deferred revenue balance as of January 1, 2018. For the three and nine months ended September 30, 2019 and 2018, 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 $278 million of the deferred revenue in the remainder of 2019, $1.0 billion in 2020, $0.8 billion in 2021 and $1.6 billion thereafter.