Stockholders' Deficit and Noncontrolling Interest (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gains (losses) related to changes in plan experience and actuarial assumptions arising during the period
Pre-Tax	$ (78)	$ 35	$ (73)
Tax Benefit (Expense)	29	(13)	28
Net of Tax	(49)	22	(45)
Prior service credit arising during the period
Pre-Tax	33
Tax Benefit (Expense)	(12)
Net of Tax	21
Amortization of amounts resulting from changes in plan experience and actuarial assumptions recognized as periodic benefit cost
Pre-Tax	16	66	19
Tax Benefit (Expense)	(6)	(28)	(7)
Net of Tax	10	38	12
Amortization of amounts resulting from changes in plan provisions recognized as periodic benefit cost
Pre-Tax		2
Tax Benefit (Expense)		(1)
Net of Tax		1
Unrealized gains (losses) arising during the period
Pre-Tax	(142)	129	(16)
Tax Benefit (Expense)	55	(49)	6
Net of Tax	(87)	80	(10)
Reclassification adjustments included in "Other, net"
Pre-Tax	189	(80)	(11)
Tax Benefit (Expense)	(72)	31	4
Net of Tax	117	(49)	(7)
Foreign currency translation adjustments
Pre-Tax	(146)	(223)	(53)
Tax Benefit (Expense)	38	50	21
Net of Tax	(108)	(173)	(32)
Unrealized holding losses on securities:
Pre-Tax			(7)
Tax Benefit (Expense)			3
Net of Tax			(4)
Reclassification adjustment for net losses recognized during period in "Other, net"
Pre-tax		2
Tax Benefit (Expense)		(1)
Net of Tax		1
Other comprehensive loss
Other Comprehensive Income (Loss), before Tax, Total	(128)	(69)	(141)
Other Comprehensive Income (Loss), Tax, Total	32	(11)	55
Other comprehensive loss	(96)	(80)	(86)
Changes in accumulated other comprehensive loss
Balance at the beginning of the period	(322)	(242)	(156)
Other comprehensive loss	(96)	(80)	(86)
Balance at the end of the period	(418)	(322)	(242)
Defined Benefit Plan Items
Other comprehensive loss
Other comprehensive loss	(18)	61	(33)
Changes in accumulated other comprehensive loss
Balance at the beginning of the period	(123)	(184)	(151)
Other comprehensive loss	(18)	61	(33)
Balance at the end of the period	(141)	(123)	(184)
Cash flow hedges
Other comprehensive loss
Other comprehensive loss	30	31	(17)
Changes in accumulated other comprehensive loss
Balance at the beginning of the period	14	(17)
Other comprehensive loss	30	31	(17)
Balance at the end of the period	44	14	(17)
Foreign Currency Items
Other comprehensive loss
Other comprehensive loss	(108)	(173)	(32)
Changes in accumulated other comprehensive loss
Balance at the beginning of the period	(213)	(40)	(8)
Other comprehensive loss	(108)	(173)	(32)
Balance at the end of the period	(321)	(213)	(40)
Unrealized Gains (Losses) on Available for Sale securities
Other comprehensive loss
Other comprehensive loss		1	(4)
Changes in accumulated other comprehensive loss
Balance at the beginning of the period		(1)	3
Other comprehensive loss		1	(4)
Balance at the end of the period			$ (1)