Retirement Benefits (Narrative) (Details) £ in Millions, shares in Millions		1 Months Ended	12 Months Ended
	Jan. 01, 2017	Dec. 31, 2022 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 GBP (£)
Defined Benefit Plan Disclosure [Line Items]
Assumed health care cost trend rate for medicare eligibles and non-medicare eligibles				6.42%
Future assumed health care cost trend rate				4.26%
Automatic company contribution (as a percent)	4.00%
401(k) Plan's assets invested in common stock				$ 737,000,000	$ 726,000,000
U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets				4,600,000,000
Projected benefit obligation for plans with projected benefit obligations in excess of plan assets				$ 4,600,000,000
Assumed health care cost trend rate for medicare eligibles and non-medicare eligibles				7.10%
Future assumed health care cost trend rate				4.00%
Cap on employer share of health care trend (as a percent)				5.00%
Cost of defined contribution plans				$ 188,000,000	173,000,000	$ 161,000,000
U.S. | Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions, next fiscal year				35,000,000
U.S. | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expected employer contributions, next fiscal year				2,000,000
Employer contributions				$ 2,000,000
U.S. | Equities and Equity Alternatives
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				50.00%
Actual asset allocation percentage				51.00%
U.S. | Equities and Equity Alternatives | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				46.00%
U.S. | Equities and Equity Alternatives | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				54.00%
U.S. | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				50.00%
Actual asset allocation percentage				49.00%
U.S. | Fixed Income | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				46.00%
U.S. | Fixed Income | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				54.00%
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets				$ 462,000,000	427,000,000
Aggregate fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets				248,000,000	210,000,000
Projected benefit obligation for plans with projected benefit obligations in excess of plan assets				564,000,000	1,300,000,000
Fair value of plan assets for plans with projected benefit obligations in excess of plan assets				312,000,000	1,000,000,000.0
Expected employer contributions, next fiscal year				$ 43,000,000
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Period between legally-prescribed negotiations between the Company and the plans' trustee				3 years
Cost of defined contribution plans				$ 170,000,000	158,000,000	140,000,000
United Kingdom | Pension Plan Funded Status Guarantee
Defined Benefit Plan Disclosure [Line Items]
Annual deficit contributions (GBP)		$ 566,000,000				$ 566,000,000	£ 450
Annual deficit contributions, period		7 years
United Kingdom | United Kingdom Pension and Postretirement Benefit Plan, Defined Benefit | Geographic Concentration Risk
Defined Benefit Plan Disclosure [Line Items]
Concentration risk (as a percent)				78.00%
United Kingdom | Equities and Equity Alternatives
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				12.00%
Actual asset allocation percentage				12.00%
United Kingdom | Equities and Equity Alternatives | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				9.00%
United Kingdom | Equities and Equity Alternatives | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				15.00%
United Kingdom | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				88.00%
Actual asset allocation percentage				88.00%
United Kingdom | Fixed Income | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				85.00%
United Kingdom | Fixed Income | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation percentage				91.00%
Pension  Benefits | U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets					4,700,000,000
Aggregate fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets				$ 4,100,000,000	4,200,000,000
Projected benefit obligation for plans with projected benefit obligations in excess of plan assets					4,700,000,000
Fair value of plan assets for plans with projected benefit obligations in excess of plan assets				4,100,000,000	4,200,000,000
Employer contributions				34,000,000	33,000,000
Pension  Benefits | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Employer contributions				59,000,000	78,000,000
Pension  Benefits | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Employer contributions				$ 20,000,000
Pension  Benefits | United Kingdom | Forecast
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			$ 0
Post-retirement Benefits | U.S.
Defined Benefit Plan Disclosure [Line Items]
Number of shares held in defined benefit plan (in shares) | shares				1
Change in plan assets (as a percent)				5.20%
Employer contributions				$ 5,000,000	5,000,000
Post-retirement Benefits | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Employer contributions				$ 3,000,000	$ 2,000,000