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Benefit Plans (Narrative) (details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Lump sum settlement acceptance rate by retirement plan participants     20.00%     20.00%  
Lump sum pension settlement payment           $ 253  
Settlement loss           84  
Defined Benefit Plan, Curtailments         $ 55    
Curtailment gain           (86)  
Future capital call commitments for limited partnership investments $ 398       $ 398    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent         50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match         70.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay         6.00%    
Defined Contribution Plan, Employers Matching Contribution, Vesting Period in Years         5 years    
Company Contribution of Eligible Compensation, Depending on Age, Percent         3% or 5%    
Benefit expense for the Company's savings plan         $ 71 $ 69 $ 71
Additional Contribution, Management Discretion [Member]              
Defined Contribution Plan, Employer Matching Contribution, Percent of Match         80.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay         6.00%    
Defined Contribution Plan, Employers Matching Contribution, Vesting Period in Years         5 years    
Defined Contribution Plan, Employer Discretionary Contribution Amount, Percent         2.00%    
First Year of Employment [Member]              
Defined Contribution Plan, Employer Matching Contribution, Percent of Match         35.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay         6.00%    
Pension Plans, Defined Benefit [Member]              
Discount rate 4.00% 3.85%       4.65% 3.80%
Settlement loss         $ 0 $ 84 $ 3
Defined benefit plan, accumulated benefit obligation $ 2,821   $ 2,962   2,821 2,962  
Future capital call commitments for limited partnership investments $ 98       $ 98    
Limited partnership equity related hedge fund strategy plan assets 57.00%       57.00%    
Limited partnership hedge fund multi strategy plan assets 37.00%       37.00%    
Limited partnership hedge fund strategy distressed investments plan assets 6.00%       6.00%    
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year         $ 11    
Cost of Living Adjustment [Member]              
Assumptions used in calculating assumed health care cost trend rate         4.00%    
Employer Subsidy on Health Care Costs [Member]              
Assumptions used in calculating assumed health care cost trend rate         4.00%    
Other Postretirement Benefit Plan [Member]              
Discount rate     3.10% 3.60% 2.50%   2.80%
Curtailment gain         $ 0 $ (86) $ 0
Defined benefit plan, health care cost trend rate assumed for next fiscal year         4.00% 4.00% 4.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year         $ 4    
Equity securities [Member]              
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum         40.00%    
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum         60.00%