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Retirement Benefits and Trusteed Assets (Pension Plan - Fair Value Measurement using Level 3 Inputs) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plans Fair Value Measurements Using Significant Unobservale Inputs [Line Items]    
The amount of total gains (losses) included in net income attributed to the change in unrealized gains or losses related to assets still held at the end of the period $ (1) $ 58
Pension Plan, Defined Benefit [Member]
   
Defined Benefit Plans Fair Value Measurements Using Significant Unobservale Inputs [Line Items]    
Beginning Balance 518 464
Realized gains (losses) 18 12
Unrealized gains (losses) 26 7
Purchases 31 283
Sales (28) (248)
Ending Balance 565 518
The amount of total gains (losses) included in net income attributed to the change in unrealized gains or losses related to assets still held at the end of the period 41 22
Pension Plan, Defined Benefit [Member] | Hedge Funds and Similar Investments [Member]
   
Defined Benefit Plans Fair Value Measurements Using Significant Unobservale Inputs [Line Items]    
Beginning Balance 339 296
Realized gains (losses) 0 18
Unrealized gains (losses) 40 (5)
Purchases 16 250
Sales 0 (220)
Ending Balance 395 339
The amount of total gains (losses) included in net income attributed to the change in unrealized gains or losses related to assets still held at the end of the period 38 16
Pension Plan, Defined Benefit [Member] | Private Equity and Other [Member]
   
Defined Benefit Plans Fair Value Measurements Using Significant Unobservale Inputs [Line Items]    
Beginning Balance 179 168
Realized gains (losses) 18 (6)
Unrealized gains (losses) (14) 12
Purchases 15 33
Sales (28) (28)
Ending Balance 170 179
The amount of total gains (losses) included in net income attributed to the change in unrealized gains or losses related to assets still held at the end of the period $ 3 $ 6