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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income tax expense	$ 213	$ 189	$ 367	$ 413
Effective tax rate	36.20%	35.60%	34.80%	35.20%
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Unrecognized Tax Benefits	$ 144		$ 144		$ 173
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations			$ 29

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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