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Quarterly Results (unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	$ 8,792	$ 8,465	$ 8,787	$ 8,463	$ 8,547	$ 8,128	$ 8,278	$ 8,362	$ 34,507	$ 33,315	$ 32,654
Net income available to common shareholders	$ 810	$ 310	$ 434	$ 709	$ 394	$ 723	$ 423	$ 766	$ 2,263	$ 2,306	$ 787
Net income earnings available to common shareholders per common share - Basic (in dollars per share)	$ 1.79	$ 0.67	$ 0.93	$ 1.49	$ 0.82	$ 1.49	$ 0.86	$ 1.54	$ 4.87	$ 4.71	$ 1.51
Net income earnings available to common shareholders per common share - Diluted (in dollars per share)	$ 1.76	$ 0.66	$ 0.92	$ 1.47	$ 0.81	$ 1.48	$ 0.86	$ 1.53	$ 4.81	$ 4.68	$ 1.50

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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- Definition

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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