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Employee Retirement Benefits (Pre- and Post-tax Amounts Recognized in AOCI) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Pension Plans [Member]
Dec. 31, 2012
Pension Plans [Member]
Dec. 31, 2013
Other Postretirement Plans [Member]
Dec. 31, 2012
Other Postretirement Plans [Member]
Actuarial Loss              
Beginning balance, January 1       $ 499 $ 393 $ 43 $ 36
Current year actuarial loss (gain)       (236) 135 (34) 8
Actuarial (gain) loss due to curtailment       (135) 0 0 0
Actuarial loss (gain) due to plan amendment       226 [1] 0 [1] 0 [1] 0 [1]
Amortization       (16) (29) (2) (1)
Ending balance, December 31       338 499 7 43
Prior Service Cost (Credit)              
Beginning balance, January 1       3 4 (40) (46)
Prior service credit due to curtailments       (3) 0 0 0
Amortization       0 (1) 5 6
Ending balance, December 31       0 3 (35) (40)
Pre-tax amount recorded in AOCI       338 502 (28) 3
After-tax amount recorded in AOCI 395 505 389 406 502 (11) 3
Pre-tax amounts in AOCI that will be recognized in periodic benefit costs in the next fiscal year       $ 6   $ 5  
[1] Primarily includes the incremental costs incurred due to risk premiums required by insurance carriers to provide annuities and the higher actuarial value of lump sums distributed earlier than previously expected retirement ages.