Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 1,305	$ 1,029
Other comprehensive income (loss)
Changes in unrealized gains and losses on securities available-for-sale	306	152
Other-than-temporary impairment not recognized in earnings on securities available-for-sale		(5)
Changes in unrealized gains (losses) on derivative hedges	2	8
Foreign currency translation	14	(3)
Reclassification for realized (gains) losses to earnings	91	59
Income tax expense (benefit) related to items of other comprehensive income	(157)	(81)
Total other comprehensive income (loss)	256	130
Comprehensive income	1,561	1,159
Comprehensive (income) loss attributable to noncontrolling interests	33	17
Comprehensive income attributable to U.S. Bancorp	$ 1,594	$ 1,176

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