Stock Compensation Plans and Other Compensation Arrangements (Details 4) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended					12 Months Ended				12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2012 Director	Dec. 31, 2012 Grants Prior to 2010 [Member]	Dec. 31, 2012 Grants During 2010 and After [Member]	Feb. 15, 2012 Restricted Stock Units (RSUs)	Feb. 15, 2012 Restricted Performance Stock Rights	Feb. 15, 2012 Cash Units	Feb. 15, 2012 Cash Performance Units	Dec. 31, 2012 Cash Units and Cash Performance Units	Dec. 31, 2012 Stock Option Plan Granted Prior To 2008	Dec. 31, 2012 2011 Long-Term Incentive Stock Plan	Dec. 31, 2012 2011 Long-Term Incentive Stock Plan Stock Option Plan	Dec. 31, 2012 Stock Option Plan	Dec. 31, 2012 Minimum	Feb. 15, 2012 Minimum Cash Units and Cash Performance Units	Dec. 31, 2012 Minimum Stock Option Plan	Feb. 15, 2012 Maximum Cash Units and Cash Performance Units	Dec. 31, 2012 Stock Option Plan Granted After 2008	Dec. 31, 2012 Stock Option	Dec. 31, 2011 Stock Option	Dec. 31, 2010 Stock Option	Dec. 31, 2012 Outstanding Stock Awards	Dec. 31, 2011 Outstanding Stock Awards	Dec. 31, 2010 Outstanding Stock Awards	Dec. 31, 2012 Restricted Stock Rights and Restricted Performance Stock Rights
Stock Option And Awards Plans [Abstract]
Stock option vesting percentage per year									25.00%								33.00%
Award vesting period									4 years				3 years				3 years				3 years
Stock options, term from grant to expiration									10 years								7 years
Aggregate number of shares issued or transferred pursuant to awards										39,100,000	6,900,000
Share limit issued in connection with other awards			100.00%
Restricted Stock forfeiture percentage if objectives are not met CPC		100.00%
Share Based Compensation Arrangements By Share Based Payment Award Award Forfeitures Percentage Objectives Not Met Non CPC		70.00%
Maximum percentage of original grant that can be earned if financial metrics are met or exceeded			200.00%
Share limit for every one share issued in connection with awards	4.5
Available for future grant										37,000,000
Required service period under 1993 SPND (years)															5 years
Number of non-employee directors with unexercised options	3
Unrecognized compensation expense related to unvested awards	$ 114							$ 125				$ 5									$ 109
Weighted-average period for unrecognized compensation expense to be charged to expense (years)																		1 year 3 months 19 days
Total intrinsic value of options exercised																		97	46	42
Common stock issued to employees in settlement of prior year stock awards that were fully vested																					2,800,000	1,400,000	1,300,000
Shares issued for stock awards and options																					172	87	76
Stock Issued During Period, Fair Value Grant Date, Share-based Compensation																					75	101	91
Shares, cash units or cash performance units granted				500,000	1,200,000	600,000	1,300,000														1,860,000	1,748,000	2,317,000
Restricted Performace Stock Rights Issued During Period Grant Date Fair Value Share Based Compensation																								102
Common stock expected to be issued in 2013 to employees in settlement of prior year stock awards that were fully vested	3,400,000
Fair value of common stock expected to be issued in 2013 - grant date	96
Cash awards, aggregate payout amount														$ 34		$ 190