Pension Benefit Plan Accounting Methodology Changes - Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative reduction of retained earnings			$ 1,297
Retained earnings	1,372	929
Accumulated other comprehensive loss	(38)	(37)
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	2,312	2,134
Accumulated other comprehensive loss	(978)	(1,247)
Scenario, Actual [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	1,372	929
Accumulated other comprehensive loss	$ (38)	$ (37)

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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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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