Income Taxes - Reconciliation of Statutory Tax Rate to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	21.00%		21.00%		21.00%
Nondeductible expenses	(3.50%)		(15.50%)		(2.10%)
Change in valuation allowance for deferred tax assets	(8.00%)		(20.40%)		0.60%
State taxes, net of federal benefit	(2.40%)		(8.60%)		(2.10%)
Tax-exempt income, credits and incentives	3.00%		38.40%		5.10%
Foreign rate differential adjusted for U.S. taxation of foreign profits	(1.90%)		(11.10%)		(0.90%)
Divestitures	(17.90%)		2.10%	[1]	0.00%	[1]
Impairments	(39.80%)	[2]	(3.10%)		0.00%
Unrecognized tax benefits	6.60%		0.80%		(1.20%)
Audit and other tax adjustments	(1.20%)		(22.90%)		(5.30%)
Excess tax benefits	0.60%		7.50%		0.00%
Other	(0.40%)		2.10%		0.00%
Effective Income Tax Rate	(43.90%)		(9.70%)		15.10%
Income taxes paid	$ 53		$ 25		$ (1)

[1] (2)    

[2] mpairment represents adjustments for the non-deductible component of goodwill in 2022 and impairment of an equity investment in 2021.(3)    In 2022, the "Other" line includes immaterial reconciling items. In 2021, the "Other" line includes two reconciling items above 5% of the federal statutory rate. The impact to the effective rate is driven by the low pretax book income in 2021, and these items are otherwise immaterial.