Revenue - Schedule of Disaggregation of Revenue (Parenthetical) (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Interest and other income	[1]	$ 57,000,000	$ 39,000,000	$ 67,000,000	$ 66,000,000
HWC [Member]
Disaggregation of Revenue [Line Items]
Interest and other income	[1]	20,000,000	4,000,000	26,000,000	10,000,000
HWC [Member] | Book of Business Settlements [Member]
Disaggregation of Revenue [Line Items]
Interest and other income		15,000,000	0	18,000,000	0
R&B [Member]
Disaggregation of Revenue [Line Items]
Interest and other income	[1]	36,000,000	34,000,000	39,000,000	54,000,000
R&B [Member] | Book of Business Settlements [Member]
Disaggregation of Revenue [Line Items]
Interest and other income		$ 30,000,000	$ 31,000,000	$ 30,000,000	$ 47,000,000

[1] Interest and other income is included in segment revenue and total revenue, however it has been presented separately in the above tables because it does not arise directly from contracts with customers. In 2022, both HWC and R&B’s interest and other income resulted primarily from book-of-business settlements. For HWC, these amounts totaled $15 million and $18 million, respectively, for three and six months ended June 30, 2022. For R&B, these amounts totaled $30 million for both the three and six months ended June 30, 2022. In the three and six months ended 2021, HWC had no significant settlements, and R&B had settlements totaling $31 million and $47 million, respectively.