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Benefit Plans (Estimated Future Minimum Benefit Payments to Participants) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
  
Defined Benefit Plan, Expected Future Benefit Payments in Year One $ 186
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 187
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 193
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 194
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 200
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter 1,024
Other Postretirement Benefit Plans, Defined Benefit [Member]
  
Defined Benefit Plan, Expected Future Benefit Payments in Year One 6
Defined Benefit Plan, Expected Future Benefit Payments in Year Two 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Three 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Four 5
Defined Benefit Plan, Expected Future Benefit Payments in Year Five 5
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter $ 16