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.

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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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- Definition

Gross amount of debt extinguished.

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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.

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Debt - Recourse Debt (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
Debt - Recourse Debt (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (51)	$ (6)		$ (61)	$ (176)
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)