Accumulated Other Comprehensive Income (AOCI) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	$ (2,146)
Other comprehensive income (loss) before reclassifications	138
Amounts reclassified from AOCI	42
Other comprehensive income (loss), tax, portion attributable to parent	19
Other Comprehensive Income (Loss), Net of Tax	199
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(1,947)
Foreign Currency Translation Adjustment [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	(1,626)
Other comprehensive income (loss) before reclassifications	202
Amounts reclassified from AOCI	0
Other comprehensive income (loss), tax, portion attributable to parent	23
Other Comprehensive Income (Loss), Net of Tax	225
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(1,401)
Deferred Gain (Loss) On Hedging Activities [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	(15)
Other comprehensive income (loss) before reclassifications	(22)
Amounts reclassified from AOCI	32
Other comprehensive income (loss), tax, portion attributable to parent	(2)
Other Comprehensive Income (Loss), Net of Tax	8
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(7)
Pension Liability Adjustment [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	(523)
Other comprehensive income (loss) before reclassifications	(9)
Amounts reclassified from AOCI	10
Other comprehensive income (loss), tax, portion attributable to parent	0
Other Comprehensive Income (Loss), Net of Tax	1
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	(522)
Unrealized Gain (Loss) On Investments [Member]
Accumulated other comprehensive income (loss)
Balance of Accumulated Other Comprehensive Income (Loss) at Beginning of Period	18
Other comprehensive income (loss) before reclassifications	(33)
Amounts reclassified from AOCI	0
Other comprehensive income (loss), tax, portion attributable to parent	(2)
Other Comprehensive Income (Loss), Net of Tax	(35)
Balance of Accumulated Other Comprehensive Income (Loss) at End of period	$ (17)