Retirement Plans (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) plan	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Change in basis point for assumptions for next year	25.00%
Defined contribution plan, cost recognized	$ 160,000,000	$ 159,000,000	$ 172,000,000
Number of nonqualified pension plans | plan	2
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ (593,000,000)	$ (593,000,000)
Expected future benefit payment, next twelve months	$ 620,000,000
Actuarial assumptions used to determine benefit obligations, Discount rate	5.10%	5.40%	2.90%
Total recognized in other comprehensive income	$ 102,000,000
Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss, before tax	197,000,000	$ 474,000,000	$ (1,000,000,000.0)
Accumulated benefit obligation for defined benefit plans	$ 9,000,000,000	8,800,000,000
Expected long term return on assets for next year	7.00%
Expected discount rate for next year	5.10%
Rate of compensation increase	3.00%
Expected benefit cost estimate for next fiscal year	$ 7,000,000
Defined benefit expense	94,000,000	(116,000,000)	(112,000,000)
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	$ (3,000,000)	$ (2,000,000)
Actuarial assumptions used to determine benefit obligations, Discount rate	5.88%	5.31%	2.59%
Total recognized in other comprehensive income	$ (3,000,000)
Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss, before tax	2,000,000	$ (6,000,000)	$ (73,000,000)
Accumulated benefit obligation for defined benefit plans	49,000,000	46,000,000
Defined benefit expense	5,000,000	5,000,000	4,000,000
Supplemental Employee Retirement Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	(22,000,000)	$ (29,000,000)	$ (21,000,000)
Expected future benefit payment, next twelve months	$ 20,000,000