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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Computation of Earnings (Loss) Per Basic/Diluted Common Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Consolidated net income (loss)	$ 361us-gaap_NetIncomeLoss	$ (23)us-gaap_NetIncomeLoss	$ 204us-gaap_NetIncomeLoss	$ 293us-gaap_NetIncomeLoss	$ 174us-gaap_NetIncomeLoss	$ 56us-gaap_NetIncomeLoss	$ 324us-gaap_NetIncomeLoss	$ 456us-gaap_NetIncomeLoss	$ 835us-gaap_NetIncomeLoss	$ 1,010us-gaap_NetIncomeLoss	$ 1,149us-gaap_NetIncomeLoss
Less: Distributed earnings to unvested share-based awards that participate in earnings									(4)us-gaap_DistributedEarnings	(5)us-gaap_DistributedEarnings	(4)us-gaap_DistributedEarnings
Less: Undistributed earnings allocated to unvested share-based awards that participate in earnings									(14)	(18)	(20)
Numerator for basic earnings per common share-income (loss) available to common shareholders									$ 817	$ 987	$ 1,125
Denominator:
Denominator for basic earnings per common share - weighted-average common shares outstanding (in shares)									716	1,024	1,112
Effect of potential dilutive common shares under the treasury stock method:
Employee stock options and others (in shares)									10	11	6
Denominator for diluted earnings per common share - weighted-average common shares outstanding plus dilutive effect of employee stock options and others (in shares)									726	1,035	1,118
Basic earnings per common share (in dollars per share)	$ 0.49us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.28us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 1.14us-gaap_EarningsPerShareBasic	$ 0.96us-gaap_EarningsPerShareBasic	$ 1.01us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share)	$ 0.49us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 1.13us-gaap_EarningsPerShareDiluted	$ 0.95us-gaap_EarningsPerShareDiluted	$ 1.01us-gaap_EarningsPerShareDiluted
Common stock weighted-average shares, unvested restricted stock rights (in shares)									15	24
Options
Antidilutive [Line Items]
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									2	5	25
Restricted Stocks
Antidilutive [Line Items]
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									4