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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Amounts were included in the statement of income as follows:        
Continuing operations $ 480 $ 494 $ 938 $ 922
Discontinued operations 0 998 0 1,043
Net Income 480 1,492 938 1,965
Pension [Member]        
Components of net periodic benefit cost:        
Service cost 18 20 36 40
Interest cost 23 26 46 52
Expected return on plan assets (38) (39) (76) (79)
Amortization of actuarial (gain) loss 15 12 30 24
Settlement/curtailment (gain) loss 0 2 0 2
Net periodic benefit (income) cost 18 21 36 39
Amounts were included in the statement of income as follows:        
Continuing operations 18 18 36 34
Discontinued operations 0 3 0 5
Net Income 18 21 36 39
Other Postretirement Benefits [Member]        
Components of net periodic benefit cost:        
Service cost 2 2 5 5
Interest cost 6 6 12 12
Expected return on plan assets (6) (6) (12) (12)
Amortization of actuarial (gain) loss 0 (1) 0 (3)
Settlement/curtailment (gain) loss 0 (9) 0 (9)
Net periodic benefit (income) cost 2 (8) 5 (7)
Amounts were included in the statement of income as follows:        
Continuing operations 2 1 5 2
Discontinued operations 0 (9) 0 (9)
Net Income $ 2 $ (8) $ 5 $ (7)