Accumulated Other Comprehensive Income (AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	$ (1,241)
Other comprehensive income (loss) before reclassifications	(633)
Amounts reclassified from AOCI	(39)
Other comprehensive income (loss), tax, portion attributable to parent	34
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(1,879)
Other Comprehensive Income (Loss), Net of Tax	(638)
Foreign Currency Translation Adjustment [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	(654)
Other comprehensive income (loss) before reclassifications	(701)
Amounts reclassified from AOCI	0
Other comprehensive income (loss), tax, portion attributable to parent	32
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(1,323)
Other Comprehensive Income (Loss), Net of Tax	(669)
Deferred Gain (Loss) On Hedging Activities [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	47	5
Other comprehensive income (loss) before reclassifications	8	(128)
Amounts reclassified from AOCI	(64)	31
Other comprehensive income (loss), tax, portion attributable to parent	21	33
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	12	(59)
Other Comprehensive Income (Loss), Net of Tax	(35)
Pension Liability Adjustment [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	(630)
Other comprehensive income (loss) before reclassifications	17
Amounts reclassified from AOCI	25
Other comprehensive income (loss), tax, portion attributable to parent	(19)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(607)
Other Comprehensive Income (Loss), Net of Tax	23
Unrealized Gain (Loss) On Investments [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	(4)
Other comprehensive income (loss) before reclassifications	43
Amounts reclassified from AOCI	0
Other comprehensive income (loss), tax, portion attributable to parent	0
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	39
Other Comprehensive Income (Loss), Net of Tax	$ 43