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Incentive Program (Narrative) (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Minimum ownership of affiliates needed for awards 50.00%    
Options and stock appreciation rights grant, minimum percentage of market value, date of grant 100.00%    
Share-based compensation arrangement by share-based payment award expiration period 10 years    
Number of shares issuable under 2003 incentive program, maximum 220,000    
Remaining shares available for award under 2003 incentive program 82,000    
Restricted Stock [Member]      
Long-term incentive awards 8,771 8,916 9,583
Percent of the shares in each award vesting after three years 50.00%    
Percent of shares in each award vesting after five years 50.00%    
Percent of the shares in each award vesting after seven years 50.00%    
Percent of shares in each award vesting in later of ten years or retirement 50.00%    
Unrecognized compensation cost $ 1,899    
Unrecognized compensation cost, weighted-average period of recognition, years 4 years 5 months    
Compensation cost charged against income $ 774 $ 856 $ 880
Income tax benefit recognized in income 42 78 80
Fair value of shares/awards vested 722 826 851
Cash payments, vested restricted stock units $ 61 $ 64 $ 67
Restricted Stock [Member] | Minimum [Member]      
Vesting Period 3 years    
Restricted Stock [Member] | Minimum [Member] | Executive Officer [Member]      
Vesting Period 5 years    
Restricted Stock [Member] | Maximum [Member]      
Vesting Period 7 years    
Restricted Stock [Member] | Maximum [Member] | Executive Officer [Member]      
Vesting Period 10 years