Shareholders' Equity (Shareholders' Equity, Accumulated Other Comprehensive Loss, Common Stock, and Preferred Stock) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Jul. 31, 2014
Class of Stock [Line Items]
Stock Repurchase Program, Authorization Amount Increase					$ 4,800,000,000
Issued	1,071,000,000		1,072,000,000
In treasury	(223,000,000)		(223,000,000)
Total shares of common stock outstanding	848,000,000		849,000,000
Defined benefit and other postretirement liability adjustments	(326,000,000)	[1]	(241,000,000)	[1]
Cumulative translation adjustment	(70,000,000)		(69,000,000)
Other	(3,000,000)		3,000,000
Total accumulated other comprehensive loss	(399,000,000)		(307,000,000)
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Stock authorized to repurchase	5,700,000,000
Treasury Stock, Value, Acquired, Cost Method	(800,000,000)		(4,356,000,000)
Number of shares of common stock repurchased from inception (in shares)	201,000,000
Approximate value of shares of common stock repurchased from inception	8,400,000,000
Repurchase of shares during the period (in shares)	13,300,000
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Number of shares of preferred stock that are authorized for issuance (in shares)	5,000,000
Number of shares preferred stock that are issued at period end (in shares)	0
Foreign Pension Plans, Defined Benefit
Class of Stock [Line Items]
Net actuarial losses	298,000,000		222,000,000
Parent [Member]
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Treasury Stock, Value, Acquired, Cost Method	$ (800,000,000)

[1] (a) Included net actuarial losses for our international pension plans of $298 million at December 31, 2014 and $222 million at December 31, 2013.