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Redeemable Noncontrolling Interest (Movement in Redeemable Noncontrolling Interest after Business Combination) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable noncontrolling interest at beginning of period	$ 1,301
Share of net earnings	44
Redeemable noncontrolling interest at end of period	1,323
Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividend payments	(24)
Currency translation gains	$ 2

As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form.

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