Shareholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Changes in accumulated other comprehensive loss, presented net of tax
Accumulated other comprehensive loss, balance beginning of period	$ (263)	$ (540)	$ (262)	$ (521)
Other comprehensive income (loss) before reclassifications	78	83	73	44
Reclassifications to net income	(3)	23	1	43
Other comprehensive income (loss), net	75	106	74	87
Accumulated other comprehensive loss, balance end of period	(188)	(434)	(188)	(434)
Defined benefit pension plans
Changes in accumulated other comprehensive loss, presented net of tax
Accumulated other comprehensive loss, balance beginning of period	(263)	(533)	(264)	(511)
Other comprehensive income (loss) before reclassifications	78	84	73	49
Reclassifications to net income	(3)	12	3	25
Other comprehensive income (loss), net	75	96	76	74
Accumulated other comprehensive loss, balance end of period	(188)	(437)	(188)	(437)
Derivative instruments
Changes in accumulated other comprehensive loss, presented net of tax
Accumulated other comprehensive loss, balance beginning of period		(7)	2	(10)
Other comprehensive income (loss) before reclassifications		(1)		(5)
Reclassifications to net income		11	(2)	18
Other comprehensive income (loss), net		10	(2)	13
Accumulated other comprehensive loss, balance end of period		$ 3		$ 3

- 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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