Retirement Benefits (Fair Value Of Plan Assets Utilizing Fair Value Hierarchy) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 4,102	$ 4,182	$ 4,272
Pension Benefits \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	492	540
Pension Benefits \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,477	1,542
Pension Benefits \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,317	2,247
Pension Benefits \| Includes Medical Benefit Component Under Section401 H And Excludes Receivables Related To Pending Security Sales [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,286	4,329
Pension Benefits \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	96	75
Pension Benefits \| Cash and cash equivalents \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Cash and cash equivalents \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Cash and cash equivalents \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	96	75
Pension Benefits \| U.S. large-capitalization
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	648	689
Pension Benefits \| U.S. large-capitalization \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| U.S. large-capitalization \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| U.S. large-capitalization \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	648	689
Pension Benefits \| U.S. small- and mid-capitalization
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	382	375
Pension Benefits \| U.S. small- and mid-capitalization \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	382	375
Pension Benefits \| U.S. small- and mid-capitalization \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| U.S. small- and mid-capitalization \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	323	408
Pension Benefits \| International \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	120	182
Pension Benefits \| International \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| International \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	203	226
Pension Benefits \| Global
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	671	680
Pension Benefits \| Global \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Global \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Global \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	671	680
Pension Benefits \| Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	418	463
Pension Benefits \| Corporate bonds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Corporate bonds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	418	463
Pension Benefits \| Corporate bonds \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Municipal bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36	36
Pension Benefits \| Municipal bonds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Municipal bonds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36	36
Pension Benefits \| Municipal bonds \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| U.S. Treasury and agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,016	1,032
Pension Benefits \| U.S. Treasury and agency securities \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| U.S. Treasury and agency securities \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,016	1,032
Pension Benefits \| U.S. Treasury and agency securities \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Diversified Credit
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	456
Pension Benefits \| Diversified Credit \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Diversified Credit \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Diversified Credit \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	456	344
Pension Benefits \| Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(3)	(6)
Pension Benefits \| Other \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(10)	(17)
Pension Benefits \| Other \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	11
Pension Benefits \| Other \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	243	233
Pension Benefits \| Real estate \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Real estate \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits \| Real estate \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	243	233
Pension Benefits \| Medical benefit assets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(222)	(200)
Pension Benefits \| Net receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	38	53
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,597	1,493	$ 1,393
Postretirement Benefits \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	527	517
Postretirement Benefits \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	187	173
Postretirement Benefits \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	658	601
Postretirement Benefits \| Includes Medical Benefit Component Under Section401 H And Excludes Receivables Related To Pending Security Sales [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,372	1,291
Postretirement Benefits \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18	25
Postretirement Benefits \| Cash and cash equivalents \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	18	25
Postretirement Benefits \| Cash and cash equivalents \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| Cash and cash equivalents \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| U.S. large-capitalization
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	459	423
Postretirement Benefits \| U.S. large-capitalization \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	353	332
Postretirement Benefits \| U.S. large-capitalization \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| U.S. large-capitalization \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106	91
Postretirement Benefits \| U.S. small- and mid-capitalization
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	100	106
Postretirement Benefits \| U.S. small- and mid-capitalization \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	100	106
Postretirement Benefits \| U.S. small- and mid-capitalization \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| U.S. small- and mid-capitalization \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	115	106
Postretirement Benefits \| International \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56	54
Postretirement Benefits \| International \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| International \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59	52
Postretirement Benefits \| Global
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	178	165
Postretirement Benefits \| Global \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| Global \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| Global \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	178	165
Postretirement Benefits \| Municipal bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	187	173
Postretirement Benefits \| Municipal bonds \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| Municipal bonds \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	187	173
Postretirement Benefits \| Municipal bonds \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	315	293
Postretirement Benefits \| Other \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| Other \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Postretirement Benefits \| Other \| NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	315	293
Postretirement Benefits \| Medical benefit assets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	222	200
Postretirement Benefits \| Net receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 3	$ 2