XML 107 R86.htm IDEA: XBRL DOCUMENT v3.3.1.900
Benefit Plans (Projected Benefit Obligations, Plan Assets and Funded Status of Pension Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 7,297    
Fair value of plan assets at end of year 6,706 $ 7,297  
Accrued pension costs (1,277) (1,012)  
Accrued postretirement health care costs (2,245) (2,461)  
Pension [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 8,330 7,137  
Service cost 86 68 $ 86
Interest cost 337 345 314
Benefits paid (431) (410)  
Actuarial losses/(gains) (317) 1,190  
Other 6 0  
Benefit obligation at end of year 8,011 8,330 7,137
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 7,297 7,077  
Actual return on plan assets (188) 615  
Employer contributions 28 15  
Benefits paid (431) (410)  
Fair value of plan assets at end of year 6,706 7,297 7,077
Net pension liability recognized at December 31 (1,305) (1,033)  
Other accrued liabilities (28) (21)  
Accrued pension costs (1,277) (1,012)  
Accrued postretirement health care costs 0 0  
Postretirement Benefit Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 2,613 2,317  
Service cost 18 15 18
Interest cost 100 107 99
Benefits paid (141) (132)  
Actuarial losses/(gains) (192) 306  
Other (6) 0  
Benefit obligation at end of year 2,392 2,613 $ 2,317
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Benefits paid (141) (132)  
Net pension liability recognized at December 31 (2,392) (2,613)  
Other accrued liabilities (147) (152)  
Accrued pension costs 0 0  
Accrued postretirement health care costs $ (2,245) $ (2,461)