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Employee Retirement Benefits (Defined Contribution Plans) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
Retirement Savings Plan [Member]
Dec. 31, 2012
Retirement Savings Plan [Member]
Dec. 31, 2011
Retirement Savings Plan [Member]
Dec. 31, 2013
Inactive in Defined Benefit Pension Plan [Member]
Retirement Savings Plan [Member]
Dec. 31, 2013
Inactive in Defined Benefit Pension Plan [Member]
Retirement Savings Plan [Member]
Maximum [Member]
Dec. 31, 2013
Active in Defined Benefit Pension Plan [Member]
Retirement Savings Plan [Member]
Dec. 31, 2013
Active in Defined Benefit Pension Plan [Member]
Retirement Savings Plan [Member]
Dec. 31, 2013
Active in Defined Benefit Pension Plan [Member]
Retirement Savings Plan [Member]
Maximum [Member]
Jun. 30, 2013
Active in Defined Benefit Pension Plan [Member]
Retirement Savings Plan [Member]
Maximum [Member]
Dec. 31, 2013
Non-participants in Executive Pension Plan [Member]
Retirement Savings Plan [Member]
Dec. 31, 2013
Employees Not Grandfathered Under Defined Benefit Pension Plan [Member]
Supplemental Retirement Savings Plan [Member]
Defined Contribution Plans Disclosure [Line Items]                      
Defined contribution plan expenses recorded $ 65 $ 53 $ 55                
Employer matching contribution percent         6.00%     6.00% 3.00%    
Employers matching contribution vesting percentage       100.00%              
Vesting period of employers matching contribution             5 years        
Additional employer contribution percent for employees age 50 and older and meeting years of service requirements           4.00%          
Maximum employer contribution percent for non-contributors                   2.00%  
Employers vesting period for non-contributors                   3 years  
Maximum ratio of eligible compensation to base salary                     2