Parent Company Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income attributable to controlling interest	$ 897	$ 900	$ 999
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	44	91	0
Stock-based compensation expense	36	75	43
Loss on extinguishment of debt	0	0	26
Gain on sale of title services business	(9)	0	0
Total adjustments	383	1,379	(285)
Net cash provided by operating activities	1,299	2,291	725
Investing Activities
Proceeds from sales and prepayments of securities	0	0	68
Proceeds from business divestitures, net	0	22	0
Net cash provided by (used in) investing activities	(2,605)	8,333	(4,601)
Preferred stock:
Proceeds from issuance of preferred stock	0	494	145
Call of preferred stock	0	0	(100)
Cash dividends paid - preferred stock	(32)	(32)	(33)
Common stock:
Stock options exercised	5	36	28
Cash dividends paid	(335)	(324)	(333)
Repurchase of shares	(10)	(12)	(416)
Net cash provided by (used in) financing activities	1,494	(10,869)	4,016
Net increase (decrease) in cash and cash equivalents	188	(245)	140
Cash and cash equivalents at beginning of period	1,543	1,788	1,648
Cash and cash equivalents at end of period	1,731	1,543	1,788
Total interest paid	1,428	280	170
Income taxes received from (paid to) subsidiaries	123	20	258
Parent Company
Operating activities:
Net income attributable to controlling interest	897	900	999
Less undistributed net income of subsidiaries	610	555	340
Income before undistributed net income of subsidiaries	287	345	659
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	8	7	8
Stock-based compensation expense	36	76	43
Loss on extinguishment of debt	0	0	26
Gain on sale of title services business	0	(22)	0
Other operating activities, net	1	2	(11)
Total adjustments	45	63	66
Net cash provided by operating activities	332	408	725
Investing Activities
Proceeds from sales and prepayments of securities	21	8	3
Purchases of securities	(1)	(1)	(10)
(Investment in) return on subsidiary	(10)	13	8
Net cash provided by (used in) investing activities	10	42	1
Preferred stock:
Proceeds from issuance of preferred stock	0	494	145
Call of preferred stock	0	0	(100)
Cash dividends paid - preferred stock	(32)	(32)	(33)
Common stock:
Stock options exercised	5	36	28
Cash dividends paid	(335)	(324)	(333)
Repurchase of shares	(10)	(13)	(416)
Repayment of term borrowings	(450)	0	(120)
Net cash provided by (used in) financing activities	(822)	161	(829)
Net increase (decrease) in cash and cash equivalents	(480)	611	(103)
Cash and cash equivalents at beginning of period	1,335	724	827
Cash and cash equivalents at end of period	855	1,335	724
Total interest paid	33	35	35
Income taxes received from (paid to) subsidiaries	$ (46)	$ 42	$ 28