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
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Financing receivables and loans held for sale [Member]	Jun. 30, 2013 Financing receivables and loans held for sale [Member]	Jun. 30, 2014 Financing receivables and loans held for sale [Member]	Jun. 30, 2013 Financing receivables and loans held for sale [Member]	Jun. 30, 2014 Cost and equity method investments [Member]	Jun. 30, 2013 Cost and equity method investments [Member]	Jun. 30, 2014 Cost and equity method investments [Member]	Jun. 30, 2013 Cost and equity method investments [Member]	Jun. 30, 2014 Long Lived Assets, Including Real Estate [Member]	Jun. 30, 2013 Long Lived Assets, Including Real Estate [Member]	Jun. 30, 2014 Long Lived Assets, Including Real Estate [Member]	Jun. 30, 2013 Long Lived Assets, Including Real Estate [Member]	Jun. 30, 2014 Total [Member]	Jun. 30, 2013 Total [Member]	Jun. 30, 2014 Total [Member]	Jun. 30, 2013 Total [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 2 [Member] Financing receivables and loans held for sale [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Financing receivables and loans held for sale [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 2 [Member] Cost and equity method investments [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Cost and equity method investments [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 2 [Member] Long Lived Assets, Including Real Estate [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Long Lived Assets, Including Real Estate [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 2 [Member] Total [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Total [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 3 [Member] Financing receivables and loans held for sale [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Financing receivables and loans held for sale [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 3 [Member] Cost and equity method investments [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Cost and equity method investments [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 3 [Member] Long Lived Assets, Including Real Estate [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Long Lived Assets, Including Real Estate [Member]	Jun. 30, 2014 Fair Value, Inputs, Level 3 [Member] Total [Member]	Dec. 31, 2013 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	$ 1,239	$ 1,426																	$ 89	$ 210	$ 296	$ 0	$ 361	$ 2,050	$ 746	$ 2,260	$ 2,007	$ 2,986	$ 428	$ 649	$ 225	$ 1,085	$ 2,660	$ 4,720
Adjustments To Assets Measured At Fair Value On Non Recurring Basis			$ (119)	$ (102)	$ (196)	$ (212)	$ (59)	$ (157)	$ (247)	$ (220)	$ (134)	$ (253)	$ (178)	$ (593)	$ (312)	$ (512)	$ (621)	$ (1,025)