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Minimum consolidated net worth covenant.

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Repurchase All Or Portion Of The Notes At Purchase Price

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Borrowings (Narrative) (Details)				12 Months Ended
Borrowings (Narrative) (Details)	Sep. 28, 2017 USD ($)	May 04, 2017 USD ($)	Apr. 18, 2017 USD ($)	Dec. 31, 2017 USD ($) subsidiary	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 15, 2017 USD ($)	Apr. 04, 2017 USD ($)	Apr. 03, 2017 USD ($) subsidiary	Feb. 28, 2017 USD ($)	Jan. 31, 2017 USD ($)
Debt Instrument [Line Items]
Tier 1 capital minimum ratio				7.25%	6.625%
Number of domestic operating subsidiaries of which the company is a guarantor \| subsidiary				8					9
Minimum guarantor asset coverage ratio				1.25
Debt redeemed		$ 4,840,000,000
Premium to redemption of debt		$ 98,000,000
Loss on debt extinguishment				$ 220,000,000	$ 12,500,000	$ 1,500,000
Percent of purchase price to principal amount which holders of debt can require company to repurchase debt upon a change in control triggering event				101.00%
Pledged assets				$ 28,200,000,000
Pledged assets, collateral amount				13,100,000,000
Financing availability with the FHLB				5,200,000,000
Financing unused and available with the FHLB				1,400,000,000
Outstanding borrowings				1,541,400,000	1,925,700,000
HMBS \| OneWest Bank \| Variable Interest Entities
Debt Instrument [Line Items]
Outstanding borrowings				$ 140,300,000	160,200,000
4.250% Senior Unsecured Notes Due August 2017
Debt Instrument [Line Items]
Percent of principal to be redeemed		100.00%
Tender Offer
Debt Instrument [Line Items]
Debt redeemed	$ 861,200,000
Debt purchased	800,000,000
Premium on debt purchased	50,600,000		$ 59,000,000
Accrued interest on debt purchased	9,300,000		9,000,000
5.500% Series C Unsecured Notes Due February 2019
Debt Instrument [Line Items]
Debt redeemed	398,000,000		1,040,000,000
Debt purchased			$ 969,000,000
5.375% Senior Unsecured Notes Due May 2020
Debt Instrument [Line Items]
Debt redeemed	302,000,000
5.000% Senior Senior Unsecured Notes Due August 2022
Debt Instrument [Line Items]
Debt redeemed	$ 100,000,000
Structured financings
Debt Instrument [Line Items]
Weighted average interest rate for debt				3.75%
6.0% Senior Unsecured Debt Due in 2036
Debt Instrument [Line Items]
Stated interest rate				6.00%
Carrying value of debt				$ 39,600,000
Par value of debt				51,000,000
Senior Notes
Debt Instrument [Line Items]
Par value of debt				$ 3,718,600,000.0
Senior Notes \| 4.250% Senior Unsecured Notes Due August 2017
Debt Instrument [Line Items]
Debt redeemed		$ 1,725,800,000
Stated interest rate		4.25%
Senior Notes \| 5.250% Senior Unsecured Notes Due March 2018
Debt Instrument [Line Items]
Debt redeemed		$ 1,465,000,000
Stated interest rate		5.25%
Senior Notes \| 6.625% Series C Unsecured Notes Due April 2018
Debt Instrument [Line Items]
Debt redeemed		$ 695,000,000
Stated interest rate		6.625%
Senior Notes \| 5.000% Senior Unsecured Notes Due May 2018
Debt Instrument [Line Items]
Debt redeemed		$ 955,900,000
Stated interest rate		5.00%
Senior Notes \| 5.500% Series C Unsecured Notes Due February 2019
Debt Instrument [Line Items]
Stated interest rate			5.50%	5.50%			5.50%	5.50%
Par value of debt				$ 383,000,000
Senior Notes \| 5.375% Senior Unsecured Notes Due May 2020
Debt Instrument [Line Items]
Stated interest rate				5.375%			5.375%	5.375%
Par value of debt				$ 435,600,000.0
Senior Notes \| 5.000% Senior Senior Unsecured Notes Due August 2022
Debt Instrument [Line Items]
Stated interest rate				5.00%			5.00%	5.00%
Par value of debt				$ 1,150,000,000
Discontinued Operation
Debt Instrument [Line Items]
Current borrowings of discontinued operations				268,200,000	1,571,000,000
Commercial Air \| Discontinued Operations, Disposed of by Sale
Debt Instrument [Line Items]
Current borrowings of discontinued operations				$ 0	1,204,600,000
Minimum
Debt Instrument [Line Items]
Minimum guarantor asset coverage ratio				1.5
Principal as a percent of maximum claim amount for which company is required to repurchase loans				98.00%
Minimum \| Structured financings
Debt Instrument [Line Items]
Weighted average interest rate for debt				0.55%
Maximum
Debt Instrument [Line Items]
Minimum guarantor asset coverage ratio				1.0
Maximum \| Tender Offer
Debt Instrument [Line Items]
Debt purchased							$ 800,000,000	$ 950,000,000
Maximum \| Structured financings
Debt Instrument [Line Items]
Weighted average interest rate for debt				5.50%
Weighted Average
Debt Instrument [Line Items]
Interest rate for FHLB advances				1.56%
Revolving Credit Facility
Debt Instrument [Line Items]
Total commitment				$ 750,000,000						$ 1,400,000,000	$ 1,500,000,000
Outstanding borrowings				0	0
Amount available to be drawn				$ 695,000,000
Revolving Credit Facility \| Commercial Air
Debt Instrument [Line Items]
Total commitment								$ 750,000,000
Revolving Credit Facility \| Commercial Air \| Discontinued Operations, Disposed of by Sale
Debt Instrument [Line Items]
Total commitment									$ 1,400,000,000.0
Minimum consolidated net worth covenant									$ 6,000,000,000
Tier 1 capital minimum ratio								9.00%
Revolving Credit Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Applicable margin				2.00%
Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Applicable margin				1.00%
Letter of Credit
Debt Instrument [Line Items]
Amount available to be drawn				$ 55,000,000
Amount of financing being utilized from FHLB				87,800,000
FRB Discount Window
Debt Instrument [Line Items]
Outstanding borrowings				0	$ 0
Loans
Debt Instrument [Line Items]
Pledged assets, collateral amount				11,600,000,000
Operating Lease Assets
Debt Instrument [Line Items]
Pledged assets, collateral amount				1,200,000,000
Cash
Debt Instrument [Line Items]
Pledged assets, collateral amount				200,000,000
Securities
Debt Instrument [Line Items]
Pledged assets, collateral amount				$ 100,000,000