Borrowings and Contractual Commitments Long-term debt (Details) (USD $)										12 Months Ended					12 Months Ended								12 Months Ended						12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Dec. 31, 2013 Parent Company [Member] Senior Notes [Member]	Dec. 31, 2012 Parent Company [Member] Senior Notes [Member]	Dec. 31, 2013 Parent Company [Member] Fixed Interest Rate Debt [Member]	Dec. 31, 2013 Parent Company [Member] Fixed Interest Rate Debt [Member] Senior Notes [Member]	Dec. 31, 2013 Parent Company [Member] Fixed Interest Rate Debt [Member] Subordinated Debt [Member]	Dec. 31, 2013 Parent Company [Member] Subordinated Debt [Member]	Dec. 31, 2012 Parent Company [Member] Subordinated Debt [Member]	Dec. 31, 2012 Parent Company [Member] Junior Subordinated Debt [Member]	Dec. 31, 2013 Parent Company [Member] Variable Rate Debt [Member] Senior Notes [Member]	Dec. 31, 2013 Parent Company [Member] Variable Rate Debt [Member] Junior Subordinated Debt [Member]	Dec. 31, 2013 Subsidiaries [Member]	Dec. 31, 2012 Subsidiaries [Member]	Dec. 31, 2013 Subsidiaries [Member] Senior Notes [Member]		Dec. 31, 2012 Subsidiaries [Member] Senior Notes [Member]		Dec. 31, 2013 Subsidiaries [Member] Fixed Interest Rate Debt [Member] Senior Notes [Member]	Dec. 31, 2013 Subsidiaries [Member] Fixed Interest Rate Debt [Member] Subordinated Debt [Member]	Dec. 31, 2013 Subsidiaries [Member] Subordinated Debt [Member]		Dec. 31, 2012 Subsidiaries [Member] Subordinated Debt [Member]		Dec. 31, 2013 Subsidiaries [Member] Variable Rate Debt [Member] Senior Notes [Member]	Dec. 31, 2013 Subsidiaries [Member] Variable Rate Debt [Member] Subordinated Debt [Member]	Dec. 31, 2013 Minimum [Member] Parent Company [Member] Senior Notes [Member]	Dec. 31, 2013 Minimum [Member] Parent Company [Member] Junior Subordinated Debt [Member]	Dec. 31, 2013 Minimum [Member] Subsidiaries [Member] Senior Notes [Member]	Dec. 31, 2013 Minimum [Member] Subsidiaries [Member] Subordinated Debt [Member]	Dec. 31, 2013 Maximum [Member] Parent Company [Member] Senior Notes [Member]	Dec. 31, 2013 Maximum [Member] Parent Company [Member] Junior Subordinated Debt [Member]	Dec. 31, 2013 Maximum [Member] Subsidiaries [Member] Senior Notes [Member]	Dec. 31, 2013 Maximum [Member] Subsidiaries [Member] Subordinated Debt [Member]	Dec. 31, 2012 Tier one risk based capital [Member] Parent Company [Member] Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount							$ 3,001,000,000	$ 2,270,000,000	$ 0.06			$ 200,000,000	$ 200,000,000						$ 1,006,000,000	[1]	$ 426,000,000	[1]
Long-term Debt, Percentage Bearing Variable Interest, Amount							283,000,000	152,000,000						627,000,000					3,783,000,000	[2]	3,846,000,000	[2]			500,000,000		500,000,000												627,000,000
Debt Instrument, Fair Value Disclosure																									1,300,000,000	[3]	1,336,000,000	[3]
Long-term Debt	$ 10,700,000,000	[4]	$ 9,357,000,000	[4]	$ 4,111,000,000	$ 3,249,000,000											$ 6,589,000,000	$ 6,108,000,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate																															0.39%	0.89%	0.36%	0.53%	3.25%	1.23%	6.98%	0.55%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																															1.00%		0.00%	5.00%	6.05%		9.65%	7.25%
Debt Instrument, Maturity Date											Feb. 15, 2026																			Aug. 24, 2015
Debt Instrument, Maturity Date Range, Start										Jul. 29, 2014					May 29, 2015	Apr. 01, 2027							Jan. 02, 2014	Sep. 01, 2015					Dec. 01, 2015
Debt Instrument, Maturity Date Range, End										Jan. 15, 2028					Aug. 01, 2019	Mar. 15, 2028							Dec. 29, 2053	Apr. 01, 2020					Dec. 19, 2043

[1] 1 Includes leases and other obligations that do not have a stated interest rate.

[2] 2 Includes $256 million and $286 million of debt recorded at fair value at December 31, 2013 and 2012, respectively.

[3] 3 Debt recorded at fair value.

[4] 3 Includes debt of consolidated VIEs of $597 million and $666 million at December 31, 2013 and 2012, respectively, of which $256 and $286 are carried at fair value at December 31, 2013 and 2012, respectively.