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Accumulated Other Comprehensive Income/(Loss) (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
Accumulated Other Comprehensive Income/(Loss) Net Of Tax [Line Items]        
Beginning balance $ (734) $ (1,169) $ (750) $ (1,186)
Other comprehensive income/(loss) before reclassifications 9 5 15 5
Amounts reclassified from accumulated other comprehensive income/(loss) 11 [1] 16 [1] 21 [1] 33 [1]
Net to-date other comprehensive income/(loss), net of taxes 20 [2] 21 [2] 36 [3] 38 [3]
Balance at June 30 (714) (1,148) (714) (1,148)
Defined Benefit Plans [Member]
        
Accumulated Other Comprehensive Income/(Loss) Net Of Tax [Line Items]        
Beginning balance (693) (1,135) (713) (1,149)
Other comprehensive income/(loss) before reclassifications 0 1 10 (2)
Amounts reclassified from accumulated other comprehensive income/(loss) 11 [1] 16 [1] 21 [1] 33 [1]
Net to-date other comprehensive income/(loss), net of taxes 11 17 31 31
Balance at June 30 (682) (1,118) (682) (1,118)
Foreign Currency Translation [Member]
        
Accumulated Other Comprehensive Income/(Loss) Net Of Tax [Line Items]        
Beginning balance (41) (33) (37) (36)
Other comprehensive income/(loss) before reclassifications 9 4 5 7
Amounts reclassified from accumulated other comprehensive income/(loss) 0 0 0 0
Net to-date other comprehensive income/(loss), net of taxes 9 4 5 7
Balance at June 30 (32) (29) (32) (29)
Derivatives [Member]
        
Accumulated Other Comprehensive Income/(Loss) Net Of Tax [Line Items]        
Beginning balance 0 (1) 0 (1)
Other comprehensive income/(loss) before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income/(loss) 0 0 0 0
Net to-date other comprehensive income/(loss), net of taxes 0 0 0 0
Balance at June 30 $ 0 $ (1) $ 0 $ (1)
[1] The accumulated other comprehensive income/(loss) reclassification components are 1) prior service cost/(benefit) and 2) net actuarial loss which are both included in the computation of net periodic pension cost. See Note 6 Retirement Plans for additional details.
[2] Net of deferred taxes of $12 million and $13 million during the three months ended June 30, 2014, and 2013, respectively.
[3] Net of deferred taxes of $17 million and $25 million during the six months ended June 30, 2014, and 2013, respectively.