Stock-Based Compensation (Incentive Equity Awards Granted By The Company) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Feb. 27, 2014
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Units, Beginning Balance	2.6
Number of Units, Granted	0.7	[1]
Number of Units, Vested/exercised	(1.2)
Number of Units, Ending Balance	2.1	[2],[3]
Weighted Average Grant Price, Beginning Balance	$ 43.11
Weighted Average Grant Price, Granted	$ 72.96	[1]
Weighted Average Grant Price, Vested/exercised	$ 36.77
Weighted Average Grant Price, Ending Balance	$ 56.79
Shares outstanding, expected to vest	2.0
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Units, Beginning Balance	0.8
Number of Units, Granted	0.2	[1]
Number of Units, Vested/exercised	(0.3)
Number of Units, Ending Balance	0.7	[4]
Weighted Average Grant Price, Beginning Balance	$ 43.36
Weighted Average Grant Price, Granted	$ 72.97	[1]
Weighted Average Grant Price, Vested/exercised	$ 30.61
Weighted Average Grant Price, Ending Balance	$ 57.98
Unrecognized compensation expense, maximum	$ 26
Stock Settled Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of Units, Beginning Balance	1.1
Number of Units, Granted	0.1	[1]
Number of Units, Vested/exercised	0
Number of Units, Ending Balance	1.2	[3],[5]
Weighted Average Grant Price, Beginning Balance			$ 20.36
Weighted Average Grant Price, Ending Balance			$ 20.36
Weighted Average Exercise Price, Beginning Balance	$ 21.43
Weighted Average Exercise Price, Granted	$ 72.97	[1]
Weighted Average Exercise Price, Vested/exercised	$ 0.00
Weighted Average Exercise Price, Ending Balance	$ 25.19
Shares outstanding, expected to vest	1.0
Shares, intrinsic value	62
Weighted average remaining contractual life, years	2 years 1 month
RSUs and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unrecognized compensation expense, maximum	$ 109
Incentive equity awards vesting ratably over a period, in years	2 years 10 months

[1] Primarily represents awards granted by the Company on February 27, 2014.

[2] Approximately 2.0 million RSUs outstanding as of June 30, 2014 are expected to vest over time.

[3] Aggregate unrecognized compensation expense related to RSUs and SSARs was $109 million as of June 30, 2014, which is expected to be recognized over a weighted average period of 2.8 years.

[4] Maximum aggregate unrecognized compensation expense was $26 million as of June 30, 2014.

[5] Approximately 1.0 million SSARs are exercisable as of June 30, 2014. The Company assumes that all unvested SSARs are expected to vest over time. SSARs outstanding as of June 30, 2014 had an intrinsic value of $62 million and have a weighted average remaining contractual life of 2.1 years.