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Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in other income, adoption of accounting guidance	$ 907	$ 761
Increase in income tax expense, adoption of accounting guidance	$ 924	$ 798
Increase in the effective income tax rate	2.00%	2.00%
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting principle	$ 0	$ 0	$ (284)

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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