Employee Benefit Plans - Deferred Compensation Plans (Details) - Deferred Compensation Plans - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	$ 4,002	$ 3,648	$ 3,273
Interest expense	$ 265	$ 293	$ 285

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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