Guarantor Consolidating Financial Statements Current Period Guarantor Balance Sheet (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 1,757,000,000	$ 1,289,000,000	$ 952,000,000	$ 572,000,000
Notes, Loans and Financing Receivable, Net	22,945,000,000	10,998,000,000
Restricted Cash and Investments	1,426,000,000	744,000,000
Restricted Cash and Cash Equivalents	1,397,000	744,000
Property, Plant and Equipment, Net	121,000,000	52,000,000
Property Subject to or Available for Operating Lease, Net	2,655,000,000	1,703,000,000
Deferred Tax Assets, Net	120,000,000	107,000,000
Goodwill	1,158,000,000	1,108,000,000
Intercompany Receivable	105,000,000	66,000,000
Other Assets	298,000,000	130,000,000
Assets	30,585,000,000	16,197,000,000
Line of Credit Facility, Amount Outstanding	17,548,000,000	9,378,000,000
Securitized Debt Obligation Liability	5,238,000,000	1,500,000,000
Accounts Payable And Accrued Expenses	492,000,000	217,000,000
Deferred Revenue	123,000,000	70,000,000
Taxes Payable	124,000,000	93,000,000
Intercompany Taxes Payable	644,000,000	559,000,000
Derivative Liabilities	135,000,000	1,000,000
Accounts Payable, Related Parties	379,000,000
Due to Affiliate
Liabilities	24,683,000,000	11,818,000,000
Additional Paid in Capital, Common Stock	4,763,000,000	3,459,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(68,000,000)	(3,000,000)
Retained Earnings (Accumulated Deficit)	1,207,000,000	923,000,000
Stockholders' Equity Attributable to Parent	5,902,000,000	4,379,000,000
Liabilities and Equity	30,585,000,000	16,197,000,000
Parent Company [Member]
Guarantor [Line Items]
Property, Plant and Equipment, Net
Deferred Tax Assets, Net	29,000,000	39,000,000
Goodwill	1,095,000,000	1,095,000,000
Intercompany Receivable	39,000,000	66,000,000
Other Assets	47,000,000	14,000,000
Due from Affiliates	4,241,000,000	2,063,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	6,156,000,000	3,274,000,000
Assets	11,607,000,000	6,551,000,000
Securitized Debt Obligation Liability	4,000,000,000	1,500,000,000
Accounts Payable And Accrued Expenses	113,000,000	22,000,000
Taxes Payable	78,000,000	91,000,000
Intercompany Taxes Payable	644,000,000	559,000,000
Accounts Payable, Related Parties	7,000,000
Due to Affiliate	863,000,000
Liabilities	5,705,000,000	2,172,000,000
Additional Paid in Capital, Common Stock	4,763,000,000	3,459,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(68,000,000)	(3,000,000)
Retained Earnings (Accumulated Deficit)	1,207,000,000	923,000,000
Stockholders' Equity Attributable to Parent	5,902,000,000	4,379,000,000
Liabilities and Equity	11,607,000,000	6,551,000,000
Guarantor Subsidiaries [Member]
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	1,053,000,000	1,252,000,000	893,000,000	500,000,000
Notes, Loans and Financing Receivable, Net	687,000,000	1,558,000,000
Property, Plant and Equipment, Net	4,000,000	4,000,000
Deferred Tax Assets, Net	(125,000,000)	(28,000,000)
Intercompany Receivable
Other Assets	32,000,000	18,000,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	2,602,000,000	2,193,000,000
Assets	5,116,000,000	4,997,000,000
Accounts Payable And Accrued Expenses	110,000,000	90,000,000
Taxes Payable		4,000,000
Intercompany Taxes Payable
Derivative Liabilities	12,000,000
Accounts Payable, Related Parties
Due to Affiliate	1,498,000,000	1,669,000,000
Liabilities	1,620,000,000	1,763,000,000
Additional Paid in Capital, Common Stock	79,000,000	79,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,000,000)	(11,000,000)
Retained Earnings (Accumulated Deficit)	3,421,000,000	3,166,000,000
Stockholders' Equity Attributable to Parent	3,496,000,000	3,234,000,000
Liabilities and Equity	5,116,000,000	4,997,000,000
Non-Guarantor Subsidiaries [Member]
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	704,000,000	37,000,000	59,000,000	72,000,000
Notes, Loans and Financing Receivable, Net	22,258,000,000	9,440,000,000
Restricted Cash and Investments	1,426,000,000	744,000,000
Property, Plant and Equipment, Net	117,000,000	48,000,000
Property Subject to or Available for Operating Lease, Net	2,655,000,000	1,703,000,000
Deferred Tax Assets, Net	216,000,000	96,000,000
Goodwill	63,000,000	13,000,000
Intercompany Receivable	66,000,000
Other Assets	219,000,000	98,000,000
Due from Affiliates
Assets	27,724,000,000	12,179,000,000
Line of Credit Facility, Amount Outstanding	17,548,000,000	9,378,000,000
Securitized Debt Obligation Liability	1,238,000,000
Accounts Payable And Accrued Expenses	269,000,000	105,000,000
Deferred Revenue	123,000,000	70,000,000
Taxes Payable	46,000,000	(2,000,000)
Intercompany Taxes Payable
Derivative Liabilities	123,000,000	1,000,000
Accounts Payable, Related Parties	372,000,000
Due to Affiliate	2,743,000,000	394,000,000
Liabilities	22,462,000,000	9,946,000,000
Common Stock, Value, Issued	801,000,000	570,000,000
Additional Paid in Capital, Common Stock	2,632,000,000	123,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(48,000,000)	13,000,000
Retained Earnings (Accumulated Deficit)	1,877,000,000	1,527,000,000
Stockholders' Equity Attributable to Parent	5,262,000,000	2,233,000,000
Liabilities and Equity	27,724,000,000	12,179,000,000
Consolidation, Eliminations [Member]
Guarantor [Line Items]
Intercompany Receivable
Due from Affiliates	(5,104,000,000)	(2,063,000,000)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(8,758,000,000)	(5,467,000,000)
Assets	(13,862,000,000)	(7,530,000,000)
Securitized Debt Obligation Liability
Accounts Payable And Accrued Expenses
Due to Affiliate	(5,104,000,000)	(2,063,000,000)
Liabilities	(5,104,000,000)	(2,063,000,000)
Common Stock, Value, Issued	(801,000,000)	(570,000,000)
Additional Paid in Capital, Common Stock	(2,711,000,000)	(202,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	52,000,000	(2,000,000)
Retained Earnings (Accumulated Deficit)	(5,298,000,000)	(4,693,000,000)
Stockholders' Equity Attributable to Parent	(8,758,000,000)	(5,467,000,000)
Liabilities and Equity	$ (13,862,000,000)	$ (7,530,000,000)