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

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- 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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- 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.

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No definition available.

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- Definition

Gross amount of debt extinguished.

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Balance Type:	debit
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- Definition

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

+ References

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Debt - Recourse Debt (Details) - USD ($) $ in Millions	3 Months Ended
Debt - Recourse Debt (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (10)	$ (170)
7.375% Senior Notes Due 2021 [Member] [Member]
Debt Instrument [Line Items]
Redeemed notes		690
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] \| 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] \| 5.5% Senior Notes Due 2024 [Member] [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ (44)