Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
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-Topic 835
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
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-Paragraph 1
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Debt - Recourse Debt (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
Debt - Recourse Debt (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (65)	$ (11)		$ (126)	$ (187)
LIBOR 1.75% Term Loan Due In 2022 [Member]
Debt Instrument [Line Items]
Redeemed notes				343
7.375% Senior Notes Due 2021 [Member] [Member]
Debt Instrument [Line Items]
Redeemed notes			$ 690
4.875% Senior Notes Due 2023 [Member] [Member]
Debt Instrument [Line Items]
Redeemed notes				$ 100
5.5% Senior Notes Due 2024 [Member] [Member]
Debt Instrument [Line Items]
Redeemed notes			671
5.5% Senior Notes Due 2025 [Member] [Member]
Debt Instrument [Line Items]
Redeemed notes			29
8.0% Senior Notes Due 2020 [Domain]
Debt Instrument [Line Items]
Redeemed notes			228
Senior Notes [Member] \| 4.0% Senior Notes Due 2021 [Domain] [Domain]
Debt Instrument [Line Items]
Issued senior notes			500
Senior Notes [Member] \| 4.5% Senior Notes Due 2023 [Domain] [Domain]
Debt Instrument [Line Items]
Issued senior notes			$ 500
Senior Notes [Member] \| 4.875% Senior Notes Due 2023 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	4.875%			4.875%
Senior Notes [Member] \| 5.5% Senior Notes Due 2024 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes			5.50%
Senior Notes [Member] \| 5.5% Senior Notes Due 2025 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes			5.50%
Unsecured Debt [Member] \| 7.375% Senior Notes Due 2021 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes			7.375%
Unsecured Debt [Member] \| 4.0% Senior Notes Due 2021 [Domain] [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes			4.00%
Unsecured Debt [Member] \| 4.5% Senior Notes Due 2023 [Domain] [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes			4.50%
Unsecured Debt [Member] \| 8.0% Senior Notes Due 2020 [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes			8.00%
Unsecured Debt [Member] \| Recourse Debt [Member] \| 4.0% Senior Notes Due 2021 [Domain] [Domain]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			$ (125)
Unsecured Debt [Member] \| Recourse Debt [Member] \| 4.875% Senior Notes Due 2023 [Member] [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			5
Unsecured Debt [Member] \| Recourse Debt [Member] \| 5.5% Senior Notes Due 2024 [Member] [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			$ (44)
London Interbank Offered Rate (LIBOR) [Member] \| LIBOR 1.75% Term Loan Due In 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.75%