Discontinued and Held-for-sale Operations Discontinued and Held-for-sale Operations (Held-for-sale Operations Recurring Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Held-for-sale Operations Recurring Fair Value [Line Items]
Other assets	$ 14,010	$ 18,741
Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	13,366	15,135
Total assets	21,542	29,276
Discontinued Operation or Asset Disposal [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Other assets	34	184
Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Total assets	177	252
Foreign Government Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	849	784
Foreign Government Debt Securities [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	177	186
Retained Interest [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Other assets		66
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	1,847	2,389
Total assets	1,984	2,796
Fair Value, Inputs, Level 1 [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Total assets	177	171
Fair Value, Inputs, Level 1 [Member] \| Foreign Government Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	490	427
Fair Value, Inputs, Level 1 [Member] \| Foreign Government Debt Securities [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	177	171
Fair Value, Inputs, Level 1 [Member] \| Retained Interest [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Other assets		0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	11,456	12,684
Total assets	18,068	22,664
Fair Value, Inputs, Level 2 [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Total assets	0	15
Fair Value, Inputs, Level 2 [Member] \| Foreign Government Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	359	357
Fair Value, Inputs, Level 2 [Member] \| Foreign Government Debt Securities [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	15
Fair Value, Inputs, Level 2 [Member] \| Retained Interest [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Other assets		0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	63	62
Total assets	1,490	3,816
Fair Value, Inputs, Level 3 [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Total assets	0	66
Fair Value, Inputs, Level 3 [Member] \| Foreign Government Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] \| Foreign Government Debt Securities [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] \| Retained Interest [Member] \| Discontinued Operation or Asset Disposal [Member] \| Fair Value, Measurements, Recurring [Member]
Held-for-sale Operations Recurring Fair Value [Line Items]
Other assets		$ 66

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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