Income Taxes - Reconciliation of Total Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of unrecognized tax benefits
Unrecognized tax benefits balance at January 1	$ 1,289	$ 1,166	$ 1,037
Gross increase for tax positions taken during a prior year	7	98	97
Gross decrease for tax positions taken during a prior year	(52)	(18)	(1)
Gross increase for tax positions taken during the current year	22	52	38
Settlement with taxing authorities	(5)	(6)	(3)
Lapse of statute of limitations	(38)	(3)	(2)
Unrecognized tax benefits balance at December 31	$ 1,223	$ 1,289	$ 1,166