Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010 Y	Dec. 31, 2009 Y
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock awards granted subsequent to January 1, 2010 have a vesting period, in years	5 years
Pre-tax compensation expense and related income tax benefit for stock -based incentives
Long-term stock awards	$ 39	$ 37	$ 37
Stock options	21	22	25
Phantom stock awards and stock appreciation rights	1	3	7
Total	61	62	69
Income tax benefit (before valuation allowance)	23	23	26
Company's long-term stock award activity
Unvested stock award shares at January 1	10,000,000	9,000,000	8,000,000
Weighted average grant date fair value	$ 19	$ 21	$ 26
Stock award shares granted	2,000,000	3,000,000	2,000,000
Weighted average grant date fair value	$ 13	$ 14	$ 8
Stock award shares vested	2,000,000	2,000,000	1,000,000
Weighted average grant date fair value	$ 20	$ 23	$ 26
Stock award shares forfeited	0	0	0
Weighted average grant date fair value	$ 18	$ 20	$ 24
Unvested stock award shares at December 31	10,000,000	10,000,000	9,000,000
Weighted average grant date fair value	$ 17	$ 19	$ 21
Company's stock option activity
Option shares outstanding, January 1	37,000,000	36,000,000	31,000,000
Weighted average exercise price	$ 21	$ 23	$ 25
Option shares granted, including restoration options	2,412,500	5,000,000	6,000,000
Weighted average exercise price	$ 13	$ 14	$ 8
Option shares exercised	0	0	0
Aggregate intrinsic value on date of exercise(A)	1	1	0
Weighted average exercise price	$ 8	$ 8	$ 0
Option shares forfeited	3,032,900	4,000,000	1,000,000
Weighted average exercise price	$ 22	$ 23	$ 22
Option shares outstanding, December 31	36,000,000	37,000,000	36,000,000
Weighted average exercise price	$ 21	$ 21	$ 23
Weighted average remaining option term (in years)	5	6	6
Option shares vested and expected to vest, December 31	36,000,000	37,000,000	36,000,000
Weighted average exercise price	$ 21	$ 22	$ 23
Aggregate intrinsic value (A)	12	23	31
Weighted average remaining option term (in years)	5	6	6
Option shares exercisable (vested), December 31	24,000,000	22,000,000	21,000,000
Weighted average exercise price	$ 25	$ 25	$ 26
Aggregate intrinsic value (A)	4	4	0
Weighted average remaining option term (in years)	4	4	4
Weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model
Weighted average grant date fair value	$ 5.07	$ 5.30	$ 2.28
Risk-free interest rate	2.69%	2.76%	2.60%
Dividend yield	2.35%	2.17%	3.70%
Volatility factor	49.03%	46.03%	39.18%
Expected option life (in years)	6	6	6
Stock-Based Compensation (Textual) (Abstract)
Accelerated stock compensation expense			6
Common stock available for granting stock options and other long term stock incentive awards	8,318,400
Typical vesting period of stock awards granted prior to January 1, 2010	10 years
Total unrecognized compensation expense	107	127	126
Remaining weighted average vesting period in years	4	5	5
Total market value (at the vesting date) of stock award shares	28	22	16
Grant and expire date	No later than 10 years
Stock option shares granted	2,412,500	5,000,000	6,000,000
Approx grant date exercise price	9 to 13
Stock option shares forfeited	3,032,900	4,000,000	1,000,000
Unrecognized compensation expense related to unvested stock options	$ 33	$ 45	$ 41
Weighted average vesting period for unvested stock options in years	3	3	3
Phantom Stock Awards [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock awards granted subsequent to January 1, 2010 have a vesting period, in years	5 to 10
Employee Stock Option [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Stock awards granted subsequent to January 1, 2010 have a vesting period, in years	over 5 years