Accumulated Other Comprehensive Income (AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income at Beginning of Period	$ (591)		$ (450)
Other comprehensive income before reclassifications	(44)		(211)
Amounts reclassified from AOCI	12		30
Tax effect	(15)		(7)
Net current period other comprehensive income	(47)		(188)
Balance of Accumulated Other Comprehensive Income at End of period	(638)		(638)
Foreign Currency Translation Adjustment [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income at Beginning of Period	(9)		136
Other comprehensive income before reclassifications	(72)		(220)
Amounts reclassified from AOCI	0		0
Tax effect	(1)		2
Net current period other comprehensive income	(73)		(218)
Balance of Accumulated Other Comprehensive Income at End of period	(82)		(82)
Deferred Gain (Loss) On Hedging Activities [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income at Beginning of Period	11	4	4	30
Other comprehensive income before reclassifications	(7)	76	2	22
Amounts reclassified from AOCI	(3)	(2)	0	11
Tax effect	5	(28)	0	(13)
Net current period other comprehensive income	(5)		2
Balance of Accumulated Other Comprehensive Income at End of period	6	50	6	50
Pension Liability Adjustment [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income at Beginning of Period	(567)		(590)
Other comprehensive income before reclassifications	(1)		8
Amounts reclassified from AOCI	15		30
Tax effect	(11)		(12)
Net current period other comprehensive income	3		26
Balance of Accumulated Other Comprehensive Income at End of period	(564)		(564)
Unrealized Gain (Loss) On Investments [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income at Beginning of Period	(26)		0
Other comprehensive income before reclassifications	36		(1)
Amounts reclassified from AOCI	0		0
Tax effect	(8)		3
Net current period other comprehensive income	28		2
Balance of Accumulated Other Comprehensive Income at End of period	$ 2		$ 2