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Employee Benefits (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
U.K. [Member]
       
Defined Benefit Plan Disclosure        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 58 51 116 104
Expected return on plan assets (83) (74) (165) (149)
Amortization of net actuarial loss 14 12 27 24
Net periodic (benefit) cost     (22) (21)
Curtailment loss (gain) and other     0 0
Total net periodic (benefit) cost (11) (11) (22) (21)
Estimate of contributions to defined benefit pension plans for the current fiscal year 183   183  
Contributions made to defined benefit pension plans 56 57 121 187
U.S. [Member]
       
Defined Benefit Plan Disclosure        
Service cost 0 0 0 0
Interest cost 32 28 64 56
Expected return on plan assets (39) (35) (78) (69)
Amortization of net actuarial loss 11 13 21 26
Net periodic (benefit) cost     7 13
Curtailment loss (gain) and other     1 0
Total net periodic (benefit) cost 4 6 8 13
Estimate of contributions to defined benefit pension plans for the current fiscal year 173   173  
Contributions made to defined benefit pension plans 33 35 73 68
Other [Member]
       
Defined Benefit Plan Disclosure        
Service cost 0 4 0 9
Interest cost 12 11 24 22
Expected return on plan assets (15) (14) (30) (29)
Amortization of net actuarial loss 2 7 4 13
Net periodic (benefit) cost     (2) 15
Curtailment loss (gain) and other     (3) 0
Total net periodic (benefit) cost (1) 8 (5) 15
Estimate of contributions to defined benefit pension plans for the current fiscal year 29   29  
Contributions made to defined benefit pension plans $ 4 $ 7 $ 16 $ 44