Shareholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Changes in accumulated other comprehensive loss, presented net of tax
Accumulated other comprehensive loss, balance beginning of period	$ (521)	$ (496)
Other comprehensive income (loss) before reclassifications	196	(51)
Reclassifications to net income	63	43
Other comprehensive income (loss), net	259	(8)
Reclassification from redeemable noncontrolling interest		(17)
Accumulated other comprehensive loss, balance end of period	(262)	(521)
Defined benefit pension plans
Changes in accumulated other comprehensive loss, presented net of tax
Accumulated other comprehensive loss, balance beginning of period	(511)	(501)
Other comprehensive income (loss) before reclassifications	202	(52)
Reclassifications to net income	45	42
Other comprehensive income (loss), net	247	(10)
Accumulated other comprehensive loss, balance end of period	(264)	(511)
Derivative instruments
Changes in accumulated other comprehensive loss, presented net of tax
Accumulated other comprehensive loss, balance beginning of period	(10)	7
Other comprehensive income (loss) before reclassifications	(6)	1
Reclassifications to net income	18	(1)
Other comprehensive income (loss), net	12
Reclassification from redeemable noncontrolling interest		(17)
Accumulated other comprehensive loss, balance end of period	2	(10)
Marketable securities
Changes in accumulated other comprehensive loss, presented net of tax
Accumulated other comprehensive loss, balance beginning of period		(2)
Reclassifications to net income		2
Other comprehensive income (loss), net		$ 2

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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