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Fair Value Measurements (Non-Recurring) (Details) (Fair value adjustments, Non-recurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost and equity method investments	$ (1,461)us-gaap_InvestmentsFairValueDisclosure	$ (205)us-gaap_InvestmentsFairValueDisclosure
Long-lived assets, including real estate	(569)	(56)
Financing receivables and loans held for sale	(4,000)	(119)
Assets Fair Value Disclosure	(6,030)us-gaap_AssetsFairValueDisclosure	(380)us-gaap_AssetsFairValueDisclosure
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost and equity method investments	0		2
Long-lived assets, including real estate	0		364
Financing receivables and loans held for sale	0		49
Assets Fair Value Disclosure	0		415
Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cost and equity method investments	2,142		387
Long-lived assets, including real estate	2,344		836
Financing receivables and loans held for sale	41,644		808
Assets Fair Value Disclosure	$ 46,130		$ 2,031

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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