Accumulated Other Comprehensive Income/(Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning balance	$ (1,148)		$ (1,061)		$ (1,186)		$ (1,054)
Other comprehensive income/(loss) before reclassifications	(11)		9		(6)		2
Amounts reclassified from accumulated other comprehensive income/(loss)	16	[1]	37	[1]	49	[1]	37	[1]
Net to-date other comprehensive income/(loss), net of taxes	5	[2]	46	[2]	43	[3]	39	[3]
Balance at September 30	(1,143)		(1,015)		(1,143)		(1,015)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning balance	(1,118)		(1,011)		(1,149)		(1,004)
Other comprehensive income/(loss) before reclassifications	1		1		(1)		(6)
Amounts reclassified from accumulated other comprehensive income/(loss)	16	[1]	37	[1]	49	[1]	37	[1]
Net to-date other comprehensive income/(loss), net of taxes	17		38		48		31
Balance at September 30	(1,101)		(973)		(1,101)		(973)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning balance	(29)		(48)		(36)		(48)
Other comprehensive income/(loss) before reclassifications	(12)		8		(5)		8
Amounts reclassified from accumulated other comprehensive income/(loss)	0		0		0		0
Net to-date other comprehensive income/(loss), net of taxes	(12)		8		(5)		8
Balance at September 30	(41)		(40)		(41)		(40)
Derivatives [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning balance	(1)		(2)		(1)		(2)
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 September 30	$ (1)		$ (2)		$ (1)		$ (2)

[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 5 Retirement Plans for additional details.

[2] Net of deferred taxes of $3 million and $28 million during the three months ended September 30, 2013, and 2012, respectively.

[3] Net of deferred taxes of $28 million and $27 million during the nine months ended September 30, 2013, and 2012, respectively.