Retirement Plans (Narrative) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) plan	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2022 USD ($) employees
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount				$ 520,000,000
Change in basis point for assumptions for next year	25.00%
Defined contribution plan, cost recognized	$ 159,000,000	$ 172,000,000	$ 154,000,000
Number of nonqualified pension plans | plan	2
Defined Contribution Plan, Number of Employees | employees				900
Divestitures	$ (287,000,000)
Defined Benefit Plan, Plan Assets, Divestiture	(255,000,000)
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(593,000,000)	(573,000,000)
Expected future benefit payment, next twelve months	610,000,000
Defined benefit plan, plan assets, amount	$ 8,845,000,000	$ 12,075,000,000	$ 12,018,000,000
Actuarial assumptions used to determine benefit obligations, Discount rate	5.40%	2.90%	2.60%
Total recognized in other comprehensive income	$ 357,000,000
Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss, before tax	474,000,000	$ (1,000,000,000.0)	$ (500,000,000)
Accumulated benefit obligation for defined benefit plans	8,800,000,000	11,800,000,000
Settlement loss	$ 0	0	0
Expected long term return on assets for next year	6.50%
Expected discount rate for next year	5.40%
Rate of compensation increase	3.00%
Expected benefit cost estimate for next fiscal year	$ 102,000,000
Defined benefit expense	(116,000,000)	(112,000,000)	32,000,000
Divestitures	0	(287,000,000)
Defined Benefit Plan, Plan Assets, Divestiture	0	(255,000,000)
U.S. Plans | Printing Papers [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit expense		(3,000,000)
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(2,000,000)	(5,000,000)
Defined benefit plan, plan assets, amount	$ 18,000,000	$ 19,000,000	$ 190,000,000
Actuarial assumptions used to determine benefit obligations, Discount rate	5.31%	2.59%	2.32%
Total recognized in other comprehensive income	$ (12,000,000)
Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss, before tax	(6,000,000)	$ (73,000,000)	$ 13,000,000
Accumulated benefit obligation for defined benefit plans	46,000,000	56,000,000
Settlement loss	0	0	1,000,000
Defined benefit expense	5,000,000	4,000,000	5,000,000
Divestitures	0	(187,000,000)
Defined Benefit Plan, Plan Assets, Divestiture	0	(175,000,000)
Supplemental Employee Retirement Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(29,000,000)	(21,000,000)	$ (31,000,000)
Expected future benefit payment, next twelve months	22,000,000
Other fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(1,139,000,000)	(1,482,000,000)
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 82,000,000	$ 266,000,000