Accumulated Other Comprehensive Income (AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	$ (57)
Other comprehensive income (loss) before reclassifications	(172)
Amounts reclassified from AOCI	36
Other comprehensive income (loss), tax, portion attributable to parent	35
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(158)
Other Comprehensive Income (Loss), Net of Tax	(101)
Foreign Currency Translation Adjustment [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	269
Other comprehensive income (loss) before reclassifications	(35)
Amounts reclassified from AOCI	0
Other comprehensive income (loss), tax, portion attributable to parent	1
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	235
Other Comprehensive Income (Loss), Net of Tax	(34)
Deferred Gain (Loss) On Hedging Activities [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	5	4
Other comprehensive income (loss) before reclassifications	(128)	9
Amounts reclassified from AOCI	31	3
Other comprehensive income (loss), tax, portion attributable to parent	33	(5)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(59)	11
Other Comprehensive Income (Loss), Net of Tax	(64)
Pension Liability Adjustment [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	(330)
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from AOCI	5
Other comprehensive income (loss), tax, portion attributable to parent	(2)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(326)
Other Comprehensive Income (Loss), Net of Tax	4
Unrealized Gain (Loss) On Investments [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	(1)
Other comprehensive income (loss) before reclassifications	(10)
Amounts reclassified from AOCI	0
Other comprehensive income (loss), tax, portion attributable to parent	3
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(8)
Other Comprehensive Income (Loss), Net of Tax	$ (7)