Revenue - Changes in Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Contract Liabilities:
Balance at beginning of period	$ 520	$ 405
Unearned revenue from cash received during the period	578	615
Revenue recognized related to contract liability balance	(598)	(500)
Balance at end of period	$ 500	$ 520