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Retirement Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Plans [Line Items]          
Pension & OPEB Descriptions     Pension Plans – We provide defined benefit retirement income to eligible non-union employees through qualified and non-qualified (supplemental) pension plans. Qualified and non-qualified pension benefits are based on years of service and the highest compensation during the latest years of employment, with specific reductions made for early retirements. Non-union employees hired on or after January 1, 2018, are no longer eligible for pension benefits, but are eligible for an enhanced 401(k) benefit as described below in other retirement programs. Other Postretirement Benefits (OPEB) – We provide medical and life insurance benefits for eligible retirees hired before January 1, 2004. These benefits are funded as medical claims and life insurance premiums are paid.    
Changes in fair value period     5 years    
OPEB Plan amendment (Note 5) $ (92)     $ (92)  
Defined benefit plans 69   $ 231 (42) $ (62)
Deferred Tax Assets, Gross $ 23   $ 1,068 $ 980  
Future net periodic OPEB cost amortization duration 8 years        
Discount rate - benefit obligations     2.42% 3.26%  
Pension Plan Master Trust future commitments for additonal contributions private equtiy partnerships     $ 147 $ 189  
Pension Plan Master Trust future commitments for additional contributions real estate partnerships and funds     7 8  
Pension [Member]          
Retirement Plans [Line Items]          
Accumulated benefit obligation     560 498  
Accumulated benefit obligation.     $ 5,200 $ 4,500  
Discount rate - benefit obligations     2.42% 3.26%  
Actual return (loss) on pension plan assets, net of fees     16.00% 20.00% (2.00%)
OPEB [Member]          
Retirement Plans [Line Items]          
OPEB Plan amendment (Note 5)     $ (2) $ (92)  
Discount rate - benefit obligations     2.22% 3.13%  
Health care cost trend rate (employees under 65)     5.64% 5.87% 6.09%
Ultimate health care cost trend rate     4.50% 4.50% 4.50%
Year ultimate trend rate reached     2038 2038 2038
OPEB [Member] | Total 2021 Forecast [Member]          
Retirement Plans [Line Items]          
Health care cost trend rate (employees under 65)   5.42%      
Ultimate health care cost trend rate   4.50%      
Year ultimate trend rate reached   2038