Retirement Benefits (Summary of the U.S. and Non-U.S. Plan Investments Measured At Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 12,575	$ 13,452
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	874	977
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,833	7,130
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290	303	$ 309
NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,578	5,042
Total investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,024	14,256
Total investments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	874	977
Total investments | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,282	7,934
Total investments | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290	303
Total investments | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,578	5,042
Common/collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,228	3,578
Common/collective trusts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	43
Common/collective trusts | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,226	3,535
Corporate obligations
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,675	2,806
Corporate obligations | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,675	2,806
Corporate stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	375	265
Corporate stocks | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	339	227
Corporate stocks | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35	37
Corporate stocks | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1	1
Private equity/partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,295	1,444
Private equity/partnerships | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,295	1,444
Government securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,579	5,100
Government securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20	23
Government securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,559	5,077
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	57	63
Real estate | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	57	63
Short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	292	488
Short-term investment funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	292	488
Short-term investment funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Company common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212	189
Company common stock | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	212	189
Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	311	323
Other investments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	7
Other investments | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13	14
Other investments | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	289	302	$ 308
Net derivative liabilities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(449)	(804)
Net derivative liabilities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ (449)	$ (804)