Businesses Held for Sale, Financing Receivables Held for Sale and Discontinued Operations (Assets and Liabilities of Businesses Held for Sale) (Details) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Held for sale [Member] USD ($)	Dec. 31, 2014 Held for sale [Member] USD ($)	Mar. 31, 2015 Held for sale [Member] Restructuring charges USD ($)	Mar. 31, 2015 Held for sale [Member] Financing Receivable [Member] Restructuring charges USD ($)	Dec. 31, 2014 Hungary Bank [Member] USD ($)	Mar. 31, 2015 ANZ Consumer Lending [Member] Held for sale [Member] USD ($)	Mar. 31, 2015 ANZ Consumer Lending [Member] Held for sale [Member] Financing Receivable [Member] AUD [Member] AUD	Mar. 31, 2015 ANZ Consumer Lending [Member] Held for sale [Member] Financing Receivable [Member] NZD [Member] NZD	Mar. 31, 2015 CLL Held for sale [Member] USD ($)	Dec. 31, 2014 CLL Held for sale [Member] USD ($)
Financial Information For Businesses Held For Sale [Line Items]
Proceeds from sale of discontinued operations	$ 0	$ 232
Cash and cash equivalents	259		320	1,560	676
Investment securities (Note 3)	41,853		47,478	7,720	448
Financing Receivables - net				31,318	2,144		93,141
Property, plant and equipment - net				7,130	37
Goodwill				4,973	106
Intangible Assets - Net				145	13
Other assets	10,148		13,026	2,597	50
Valuation allowance on disposal group				(1,845)
Assets of businesses held for sale	31,252		36,785	53,598	3,474	29,952		3,107	6,093			44,398
Accounts Payable				747	4
Other Current Liabilities-Discops				919	3
Short-term borrowings	66,178		68,515	836	435
Deferred Tax Liabilities, Net	11,061		7,419	255	(31)
Bank Deposits				1,711	1,931
Long-term borrowings				230	0
All other liabilities	1,010		845	1,636	92
Liabilities of businesses held for sale	1,951		2,139	6,334	2,434			2,177	286			3,871
Estimated loss on disposal										6,800	1,400		$ 1,845