Earnings (Loss) Per Common Share Level 4 (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net Income (Loss) Attributable to Parent [Abstract]
Income (Loss) from Continuing Operations Attributable to Parent	$ 467	$ 466
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	0	29
Net Income (Loss) Attributable to Parent	$ 467us-gaap_NetIncomeLoss	$ 495us-gaap_NetIncomeLoss
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted Average Number of Shares Outstanding, Basic	422.6	449.8
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	5.6	22.6
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	5.5	6.2
Weighted Average Number of Shares Outstanding, Diluted	433.7	478.6
Earnings Per Share, Basic and Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.11	$ 1.04
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 0.00	$ 0.06
Earnings Per Share, Basic	$ 1.11us-gaap_EarningsPerShareBasic	$ 1.10us-gaap_EarningsPerShareBasic
Income (Loss) from Continuing Operations, Per Diluted Share	$ 1.08	$ 0.97
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.06
Earnings Per Share, Diluted	$ 1.08us-gaap_EarningsPerShareDiluted	$ 1.03us-gaap_EarningsPerShareDiluted

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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

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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.

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