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Fair Value Measurements (Non-Recurring) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2012
Financing receivables and loans held for sale [Member]
|
Jun. 30, 2012
Financing receivables and loans held for sale [Member]
|
Sep. 30, 2011
Financing receivables and loans held for sale [Member]
|
Sep. 30, 2011
Financing receivables and loans held for sale [Member]
|
Sep. 30, 2012
Cost and equity method investments [Member]
|
Jun. 30, 2012
Cost and equity method investments [Member]
|
Sep. 30, 2011
Cost and equity method investments [Member]
|
Sep. 30, 2011
Cost and equity method investments [Member]
|
Sep. 30, 2012
Long Lived Assets, Including Real Estate [Member]
|
Jun. 30, 2012
Long Lived Assets, Including Real Estate [Member]
|
Sep. 30, 2011
Long Lived Assets, Including Real Estate [Member]
|
Sep. 30, 2011
Long Lived Assets, Including Real Estate [Member]
|
Sep. 30, 2012
Total [Member]
|
Jun. 30, 2012
Total [Member]
|
Sep. 30, 2011
Total [Member]
|
Sep. 30, 2011
Total [Member]
|
Sep. 30, 2012
Fair Value, Inputs, Level 2 [Member]
Financing receivables and loans held for sale [Member]
|
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Financing receivables and loans held for sale [Member]
|
Sep. 30, 2012
Fair Value, Inputs, Level 2 [Member]
Cost and equity method investments [Member]
|
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Cost and equity method investments [Member]
|
Sep. 30, 2012
Fair Value, Inputs, Level 2 [Member]
Long Lived Assets, Including Real Estate [Member]
|
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Long Lived Assets, Including Real Estate [Member]
|
Sep. 30, 2012
Fair Value, Inputs, Level 2 [Member]
Total [Member]
|
Dec. 31, 2011
Fair Value, Inputs, Level 2 [Member]
Total [Member]
|
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Financing receivables and loans held for sale [Member]
|
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Financing receivables and loans held for sale [Member]
|
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Cost and equity method investments [Member]
|
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Cost and equity method investments [Member]
|
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Long Lived Assets, Including Real Estate [Member]
|
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Long Lived Assets, Including Real Estate [Member]
|
Sep. 30, 2012
Fair Value, Inputs, Level 3 [Member]
Total [Member]
|
Dec. 31, 2011
Fair Value, Inputs, Level 3 [Member]
Total [Member]
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||||||||||||||||||||||||||
| Fair value assets measured on non recurring basis | $ 1,862 | $ 482 | $ 158 | $ 4 | $ 0 | $ 483 | $ 1,343 | $ 969 | $ 1,501 | $ 3,798 | $ 5,159 | $ 336 | $ 402 | $ 1,484 | $ 3,254 | $ 5,618 | $ 8,815 | ||||||||||||||||
| Adjustments To Assets Measured At Fair Value On Non Recurring Basis | $ (411) | $ (225) | $ (254) | $ (716) | $ (105) | $ (50) | $ (84) | $ (254) | $ (473) | $ (271) | $ (367) | $ (1,262) | $ (989) | $ (546) | $ (705) | $ (2,232) | |||||||||||||||||