Income and Other Taxes - Unrecognized Tax Benefits Rollforward (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, Beginning	$ 201		$ 225		$ 186
Additions related to current year	60		28		43
Additions related to prior years positions	39		5		38
Reductions related to prior years positions	(19)		(36)		(17)
Settlements with taxing authorities	0	[1]	(13)	[1]	(14)	[1]
Reductions related to lapse of statute of limitations	(14)		(8)		(8)
Currency	0		0		(3)
Balance, Ending	267		201		225
Unrecognized Tax Benefits, Reasonably Possible but Uncertainty of Timing	36		16		36
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 20		$ 20		$ 28

[1] (1)Majority of settlements did not result in the utilization of cash.