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Accumulated Other Comprehensive Income (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	May. 31, 2015 EUR (€)	Dec. 31, 2014 USD ($)	May. 31, 2014 EUR (€)
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (1,226)	$ 420	$ (658)	$ 384
Ending balance	(1,046)	359	(1,046)	359
Carrying value					$ 6,995		$ 5,982
Accumulated other comprehensive income (loss)	(1,226)	420	(658)	384	(1,046)		(658)
Accumulated Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss) adjustments during the period	153	82	(374)	110
Other comprehensive income (loss), adjustments reclassified to income	0	(132)	0	(132)
Income taxes	16	0	(34)	0
Other comprehensive income (loss), net of tax	169	(50)	(408)	(22)
Ending balance	(673)	652	(673)	652
Accumulated other comprehensive income (loss)	(673)	652	(673)	652	(673)
Accumulated Defined Benefit Plans Adjustment [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss) adjustments during the period	0	(41)	(2)	(41)
Other comprehensive income (loss), adjustments reclassified to income	15	19	30	29
Income taxes	(4)	11	(8)	9
Other comprehensive income (loss), net of tax	11	(11)	20	(3)
Ending balance	(373)	(293)	(373)	(293)
Accumulated other comprehensive income (loss)	$ (373)	$ (293)	$ (373)	$ (293)	(373)
Euro Notes [Member] | Net Investment Hedging [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Face value of notes | €						€ 1,000,000,000		€ 1,000,000,000
Accumulated other comprehensive income related to net investment hedge unrealized gain					250		$ 158
Euro Notes Issued May 2015 [Member] | Notes Payable, Other Payables [Member] | Net Investment Hedging [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Carrying value					1,100
Euro Notes Issued May 2014 [Member] | Notes Payable, Other Payables [Member] | Net Investment Hedging [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Carrying value					$ 1,100

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