Stock-Based and Other Compensation Plans (Details 2) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 01, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock option activity [Rollforward]
Exercised (in shares)		(954,898)	(343,145)
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Share price ($ per share)	$ 31.65
Stock Option
Assumptions used to value stock option awards [Abstract]
Expected term (in years)		6 years 3 months 18 days	6 years	5 years 10 months 24 days
Expected volatility (in hundredths)		32.40%	32.60%	35.10%
Risk-free rate (in hundredths)		1.60%	1.40%	1.80%
Expected dividend yield (in hundredths)		0.70%	1.20%	1.10%
Weighted-average grant-date fair value of options granted (in dollars per share)		$ 10.10	$ 13.93	$ 20.31
Stock option activity [Rollforward]
Outstanding, beginning balance (in shares)		14,571,012
Granted (in shares)		2,441,042
Exercised (in shares)		(954,898)
Forfeited (in shares)		(968,294)
Outstanding, ending balance (in shares)		15,088,862	14,571,012
Exercisable (in shares)		10,999,318
Stock option activity, additional disclosures [Abstract]
Weighted average exercise price per share outstanding, beginning balance (in dollars per share)		$ 44.59
Weighted average exercise price per share granted (in dollars per share)		31.66
Weighted average exercise price per share exercised (in dollars per share)		25.96
Weighted average exercise price per share forfeited (in dollars per share)		47.27
Weighted average exercise price per share outstanding, ending balance (in dollars per share)		43.49	$ 44.59
Weighted average exercise price per exercisable share (in dollars per share)		$ 44.54
Weighted average remaining contractual term of shares outstanding (in years)		5 years 4 months 24 days
Aggregate intrinsic value of shares outstanding		$ 40
Weighted average remaining contractual term, exercisable shares (in years)		4 years 3 months 18 days
Aggregate intrinsic value, exercisable shares		$ 26
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Minimum term to maturity on US Treasuries used to determine the risk free rate assumption in valuing stock options		5 years
Maximum term to maturity on US Treasuries used to determine the risk free rate assumption in valuing stock options		7 years
The period ended, prior to the date of grant, over which an average of daily stock prices is computed in determining the dividend yield		3 years
Duration of dividends		1 year
Total intrinsic value of options exercised		$ 10	$ 7	$ 58
Unrecognized compensation cost related to nonvested awards		$ 26
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)		1 year 3 months 18 days
Restricted Stock
Assumptions used to value stock option awards [Abstract]
Expected volatility (in hundredths)		38.00%	30.00%
Risk-free rate (in hundredths)		1.00%	0.80%
Restricted stock awards, shares subject to service conditions, additional disclosures [Abstract]
Weighted average award date fair value, shares awarded (in dollars per share)		$ 29.99	$ 35.53	$ 41.22
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
The period ended, prior to the date of grant, over which an average of daily stock prices is computed in determining the dividend yield		3 years
Unrecognized compensation cost related to nonvested awards		$ 32
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)		1 year 3 months 18 days
Weighted average award date fair value, shares awarded (in dollars per share)		$ 29.99	$ 35.53	$ 41.22
Total fair value of vested restricted stock		$ 24	$ 62	$ 50
Phantom Share Units (PSUs)
Assumptions used to value stock option awards [Abstract]
Expected volatility (in hundredths)		38.00%
Risk-free rate (in hundredths)		0.90%
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Unrecognized compensation cost related to nonvested awards		$ 18
The weighted-average period over which unrecognized compensation cost is to be recognized (in years)		2 years
Stock Option And Restricted Stock Plan 1992
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Maximum number of shares of common stock authorized for issuance After April 26, 2011 (in shares)		77,400,000
Number of shares of common stock reserved for issuance (in shares)		27,581,280
Shares of common stock available for future grants and awards (in shares)		13,059,725
Expiration period (in years)		10 years
Stock option vesting period		3 years
Stock Option And Restricted Stock Plan 1992 | Phantom Share Units (PSUs)
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Stock option vesting period	3 years
Issued (shares)	1,000,000
Maximum number of times fair market value of stock price of award issued	400.00%
Accrued liability		$ 9
2015 Stock Plan for Non-Employee Directors
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Maximum number of shares of common stock authorized for issuance After April 26, 2011 (in shares)		708,996
Number of shares of common stock reserved for issuance (in shares)		705,615
Shares of common stock available for future grants and awards (in shares)		563,075
Stock Plan for Non-Employee Directors 2005
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Number of shares of common stock reserved for issuance (in shares)		404,865
Expiration period (in years)		10 years
Stock option vesting period		1 year
Subject to Time Vesting | Restricted Stock
Restricted Stock Awards Activity [Roll Forward]
Outstanding, beginning balance (in shares)		1,019,470
Awarded (in shares)		898,916
Vested (in shares)		(421,227)
Forfeited (in shares)		(125,379)
Outstanding, ending balance (in shares)		1,371,780	1,019,470
Restricted stock awards, shares subject to service conditions, additional disclosures [Abstract]
Weighted average award date fair value, beginning of period (in dollars per share)		$ 45.55
Weighted average award date fair value, shares awarded (in dollars per share)		31.67
Weighted average award date fair value, shares vested (in dollars per share)		52.50
Weighted average award date fair value, shares forfeited (in dollars per share)		35.54
Weighted average award date fair value, end of period (in dollars per share)		36.37	$ 45.55
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Weighted average award date fair value, shares awarded (in dollars per share)		$ 31.67
Subject to Time Vesting | Phantom Share Units (PSUs)
Restricted Stock Awards Activity [Roll Forward]
Outstanding, beginning balance (in shares)		0
Awarded (in shares)		791,000
Vested (in shares)		(2,501)
Forfeited (in shares)		(76,410)
Outstanding, ending balance (in shares)		712,089	0
Restricted stock awards, shares subject to service conditions, additional disclosures [Abstract]
Weighted average award date fair value, beginning of period (in dollars per share)		$ 0.00
Weighted average award date fair value, shares awarded (in dollars per share)		31.65
Weighted average award date fair value, shares vested (in dollars per share)		31.65
Weighted average award date fair value, shares forfeited (in dollars per share)		31.65
Weighted average award date fair value, end of period (in dollars per share)		31.65	$ 0.00
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Weighted average award date fair value, shares awarded (in dollars per share)		$ 31.65
Subject to Market Conditions | Restricted Stock
Restricted Stock Awards Activity [Roll Forward]
Outstanding, beginning balance (in shares)		1,929,922
Awarded (in shares)		363,256
Vested (in shares)		(340,410)
Forfeited (in shares)		(449,776)
Outstanding, ending balance (in shares)		1,502,992	1,929,922
Restricted stock awards, shares subject to service conditions, additional disclosures [Abstract]
Weighted average award date fair value, beginning of period (in dollars per share)		$ 28.50
Weighted average award date fair value, shares awarded (in dollars per share)		24.80
Weighted average award date fair value, shares vested (in dollars per share)		42.71
Weighted average award date fair value, shares forfeited (in dollars per share)		37.86
Weighted average award date fair value, end of period (in dollars per share)		27.43	$ 28.50
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Weighted average award date fair value, shares awarded (in dollars per share)		$ 24.80
Subject to Market Conditions | Phantom Share Units (PSUs)
Restricted Stock Awards Activity [Roll Forward]
Outstanding, beginning balance (in shares)		0
Awarded (in shares)		218,180
Vested (in shares)		0
Forfeited (in shares)		(8,676)
Outstanding, ending balance (in shares)		209,504	0
Restricted stock awards, shares subject to service conditions, additional disclosures [Abstract]
Weighted average award date fair value, beginning of period (in dollars per share)		$ 0.00
Weighted average award date fair value, shares awarded (in dollars per share)		6.82
Weighted average award date fair value, shares vested (in dollars per share)		0.00
Weighted average award date fair value, shares forfeited (in dollars per share)		6.82
Weighted average award date fair value, end of period (in dollars per share)		6.82	$ 0.00
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Weighted average award date fair value, shares awarded (in dollars per share)		$ 6.82
Officer | Stock Option And Restricted Stock Plan 1992 | Phantom Share Units (PSUs)
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Stock option vesting period	2 years
Minimum | Stock Option And Restricted Stock Plan 1992
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Stock option vesting period		2 years