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Defined contribution plan
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Defined contribution plan Defined contribution planThe Company has defined contribution plans to which certain employees of the Company and participating subsidiaries may defer compensation for income tax purposes. Participants are eligible to receive matching contributions based on their contributions, in addition to other Company contributions. Defined contribution plan expenses were $231 million, $220 million and $173 million for the years ended December 31, 2020, 2019 and 2018, respectively.