Income Taxes (Schedule of Reconciliation of Unrecognized Tax Benefits Included in Uncertain Tax Positions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
As of the beginning of the year	$ 228		$ 244	$ 218
Increases in tax positions for the current year	13		7	3
Increases in tax positions for prior years	76		24	57
Decreases in tax positions for prior years	(126)		(46)	(32)
Decreases due to settlements	(33)		(1)	(2)
As of the end of the year	158		228	244
Total uncertain tax positions that if recognized would impact the effective tax rate	144		245	258
Total amount of interest expense (benefit) and penalties recognized in the consolidated statements of operations	(12)	[1]	2	12
Total amount of interest expense and penalties recognized in the consolidated balance sheets	43		$ 67	$ 65
Decreases in interest and penalties due to settlements	$ (12)

[1] This amount reflects interest on uncertain tax positions, the impact of currency and release of certain tax positions as a result of audit closure that was reflected in the consolidated statements of operations. In addition, the Company also paid an additional $12 million of previously accrued amounts due to settlements of tax examinations.