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Retirement Plans (Projected Benefit Obligation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 1,673    
Fair value of plan assets at end of year 1,572 $ 1,673  
Amounts recognized in the consolidated balance sheet [Abstract]      
Pension and other postretirement benefits - current (33) (124)  
Pension and other postretirement benefits - noncurrent (1,163) (1,141)  
Pension Benefits [Member]      
Change in projected benefit obligation (PBO) [Roll Forward]      
PBO at beginning of year 2,210 1,669  
PBO for plans of the Connecticut operations at contracted discount rate   342  
Actuarial adjustment to PBO for plans of the Connecticut operations 5 5  
Service cost 55 42 $ 48
Interest cost 88 80 76
Actuarial (gain)/loss (88) 182  
Benefits paid (128) (110)  
PBO at end of year 2,142 2,210 1,669
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 1,673 1,217  
Assets transferred to plan as a result of acquisition 5 342  
Actual return on plan assets (40) 141  
Employer contributions 62 83 62
Benefits paid (128) (110)  
Fair value of plan assets at end of year 1,572 1,673 1,217
Funded status (570) (537)  
Amounts recognized in the consolidated balance sheet [Abstract]      
Pension and other postretirement benefits - current (9) (101)  
Pension and other postretirement benefits - noncurrent (561) (436)  
Accumulated other comprehensive loss 584 532  
Postretirement Benefits Other Than Pensions (OPEB) [Member]      
Change in projected benefit obligation (PBO) [Roll Forward]      
PBO at beginning of year 727 385  
PBO for plans of the Connecticut operations at contracted discount rate 5 211  
Service cost 19 11 13
Interest cost 30 22 17
Plan participants' contributions 5 5  
Actuarial (gain)/loss (115) 115  
Benefits paid (25) (19)  
Plan change (20) (3)  
PBO at end of year 626 727 385
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year   2  
Plan participant's contributions 5 5  
Employer contributions 20 12  
Benefits paid (25) (19)  
Fair value of plan assets at end of year     $ 2
Funded status (626) (727)  
Amounts recognized in the consolidated balance sheet [Abstract]      
Pension and other postretirement benefits - current (24) (22)  
Pension and other postretirement benefits - noncurrent (602) (705)  
Accumulated other comprehensive loss $ (20) $ 119