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Fair Value Measurements (Non-Recurring) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
|
Jun. 30, 2013
Financing receivables and loans held for sale [Member]
|
Jun. 30, 2012
Financing receivables and loans held for sale [Member]
|
Jun. 30, 2013
Financing receivables and loans held for sale [Member]
|
Jun. 30, 2012
Financing receivables and loans held for sale [Member]
|
Jun. 30, 2013
Cost and equity method investments [Member]
|
Jun. 30, 2012
Cost and equity method investments [Member]
|
Jun. 30, 2013
Cost and equity method investments [Member]
|
Jun. 30, 2012
Cost and equity method investments [Member]
|
Jun. 30, 2013
Long Lived Assets, Including Real Estate [Member]
|
Jun. 30, 2012
Long Lived Assets, Including Real Estate [Member]
|
Jun. 30, 2013
Long Lived Assets, Including Real Estate [Member]
|
Jun. 30, 2012
Long Lived Assets, Including Real Estate [Member]
|
Jun. 30, 2013
Total [Member]
|
Jun. 30, 2012
Total [Member]
|
Jun. 30, 2013
Total [Member]
|
Jun. 30, 2012
Total [Member]
|
Jun. 30, 2013
Fair Value, Inputs, Level 2 [Member]
Financing receivables and loans held for sale [Member]
|
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Financing receivables and loans held for sale [Member]
|
Jun. 30, 2013
Fair Value, Inputs, Level 2 [Member]
Cost and equity method investments [Member]
|
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Cost and equity method investments [Member]
|
Jun. 30, 2013
Fair Value, Inputs, Level 2 [Member]
Long Lived Assets, Including Real Estate [Member]
|
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Long Lived Assets, Including Real Estate [Member]
|
Jun. 30, 2013
Fair Value, Inputs, Level 2 [Member]
Total [Member]
|
Dec. 31, 2012
Fair Value, Inputs, Level 2 [Member]
Total [Member]
|
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Financing receivables and loans held for sale [Member]
|
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Financing receivables and loans held for sale [Member]
|
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Cost and equity method investments [Member]
|
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Cost and equity method investments [Member]
|
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Long Lived Assets, Including Real Estate [Member]
|
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Long Lived Assets, Including Real Estate [Member]
|
Jun. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Total [Member]
|
Dec. 31, 2012
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 | $ 1,611 | $ 2,412 | $ 260 | $ 366 | $ 13 | $ 8 | $ 908 | $ 702 | $ 1,181 | $ 1,076 | $ 2,658 | $ 4,094 | $ 778 | $ 313 | $ 2,284 | $ 2,182 | $ 5,720 | $ 6,589 | ||||||||||||||||
| Adjustments To Assets Measured At Fair Value On Non Recurring Basis | $ (102) | $ (105) | $ (212) | $ (211) | $ (157) | $ (38) | $ (220) | $ (58) | $ (253) | $ (106) | $ (593) | $ (245) | $ (512) | $ (249) | $ (1,025) | $ (514) | ||||||||||||||||||