Fair Value Measurements (Level 3 Measurements) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value assets measured on non recurring basis	$ 1,426	$ 2,412
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	2,813	2,990
Individually Insignificant Recurring Fair Value Measurements	173	233
Individually Insignificant NonRecurring Fair Value Measurements	566	285
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value assets measured on non recurring basis	4,720	6,589
Fair Value, Inputs, Level 3 [Member] | Financing receivables and loans held for sale [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value assets measured on non recurring basis	2,986	4,094
Fair Value, Inputs, Level 3 [Member] | Cost and equity method investments [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value assets measured on non recurring basis	649	313
Fair Value, Inputs, Level 3 [Member] | Long Lived Assets, Including Real Estate [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value assets measured on non recurring basis	1,085	2,182
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Investments, Fair Value Disclosure	898	1,652
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	1.50%	1.30%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	13.30%	29.90%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Domestic Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	6.50%	11.10%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Income Approach Valuation Techniques [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Investments, Fair Value Disclosure	6,854	4,977
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	1.20%	2.10%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	10.50%	13.10%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Income Approach Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	3.70%	3.80%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Investments, Fair Value Disclosure	819	865
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	1.40%	1.50%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	46.00%	25.00%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Foreign Corporate Debt Securities [Member] | Income Approach Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	15.10%	13.20%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach Valuation Techniques [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Investments, Fair Value Disclosure	288	360
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Weighted Average Cost Of Capital Used For Level Three Valuation		8.70%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Weighted Average Cost Of Capital Used For Level Three Valuation		10.20%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Weighted Average Cost Of Capital Used For Level Three Valuation		8.70%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	5.20%
Weighted Average Cost Of Capital Used For Level Three Valuation	9.30%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	5.30%
Weighted Average Cost Of Capital Used For Level Three Valuation	9.30%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	5.30%
Weighted Average Cost Of Capital Used For Level Three Valuation	9.30%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | EBITDA Multiple [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	8.3
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | EBITDA Multiple [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	12.5
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Other 1 [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | EBITDA Multiple [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	10.6
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach And Business Enterprise Valuation Techniques [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value assets measured on non recurring basis	1,937	2,835
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach And Business Enterprise Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	6.60%
EBITDA Multiple Used For Level Three Valuation		2.0
Range Capitalization Rate Used For Level Three Valuation	5.50%	3.80%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach And Business Enterprise Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	6.60%
EBITDA Multiple Used For Level Three Valuation		6.0
Range Capitalization Rate Used For Level Three Valuation	16.70%	14.00%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach And Business Enterprise Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	6.60%
EBITDA Multiple Used For Level Three Valuation		4.8
Range Capitalization Rate Used For Level Three Valuation	8.00%	8.00%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach And Business Enterprise Valuation Techniques [Member] | EBITDA Multiple [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	4.3
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach And Business Enterprise Valuation Techniques [Member] | EBITDA Multiple [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	5.5
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financing receivables and loans held for sale [Member] | Income Approach And Business Enterprise Valuation Techniques [Member] | EBITDA Multiple [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	4.8
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Techniques [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value assets measured on non recurring basis	100	72
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Capitalization Rate Used For Level Three Valuation		9.20%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Capitalization Rate Used For Level Three Valuation		12.80%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Capitalization Rate Used For Level Three Valuation		12.00%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	5.70%
Fair Value Inputs, Revenue Multiple	9.3
Range Capitalization Rate Used For Level Three Valuation	8.50%
Weighted Average Cost Of Capital Used For Level Three Valuation	9.30%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	5.90%
Fair Value Inputs, Revenue Multiple	12.6
Range Capitalization Rate Used For Level Three Valuation	10.60%
Weighted Average Cost Of Capital Used For Level Three Valuation	9.60%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	5.80%
Fair Value Inputs, Revenue Multiple	10.9
Range Capitalization Rate Used For Level Three Valuation	10.00%
Weighted Average Cost Of Capital Used For Level Three Valuation	9.40%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | EBITDA Multiple [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	7.1
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | EBITDA Multiple [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	14.5
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Cost and equity method investments [Member] | Income Approach And Market Comparable Valuation Techniques [Member] | EBITDA Multiple [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
EBITDA Multiple Used For Level Three Valuation	11.3
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Techniques [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value assets measured on non recurring basis	$ 691	$ 985
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Techniques [Member] | Lower Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	4.00%
Range Capitalization Rate Used For Level Three Valuation	5.40%	4.80%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Techniques [Member] | Upper Limit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	23.00%
Range Capitalization Rate Used For Level Three Valuation	14.50%	14.60%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Long Lived Assets, Including Real Estate [Member] | Income Approach Valuation Techniques [Member] | Weighted Average [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Range Discount Rate Used For Level Three Valuation	8.80%
Range Capitalization Rate Used For Level Three Valuation	7.80%	7.30%