Derivative Instruments (Detail 5) (Details) - USD ($) $ in Millions		Dec. 31, 2019		Dec. 31, 2018
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash		$ 191		$ 244
Net derivative assets (liabilities)	[1]	114		(141)
Derivative Asset, Current	[1]	156	[2]	142	[3]
Derivative Asset, Noncurrent	[1]	246	[2]	160	[3]
Derivative Asset	[1]	402		302
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0		188
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		114		47
Derivative Liability, Current	[1]	(225)	[2]	(303)	[3]
Derivative Liability, Noncurrent	[1]	(63)	[2]	(140)	[3]
Derivative Liability	[1]	(288)		(443)
Future [Member]
Derivative [Line Items]
Derivative Asset, Current	[1]	0		0
Derivative Asset, Noncurrent	[1]	0		0
Derivative Asset		872		933
Derivative Liability, Current	[1]	0		0
Derivative Liability, Noncurrent	[1]	0		0
Derivative Liability		(984)		(932)
Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Asset, Current	[1]	2		30
Derivative Asset, Noncurrent	[1]	10		10
Derivative Asset		12		40
Derivative Liability, Current	[1]	(13)		(4)
Derivative Liability, Noncurrent	[1]	(18)		(6)
Derivative Liability		(31)		(10)
Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Current	[1]	154		112
Derivative Asset, Noncurrent	[1]	236		150
Derivative Asset	[4]	539		550
Derivative Liability, Current	[1]	(212)		(299)
Derivative Liability, Noncurrent	[1]	(45)		(134)
Derivative Liability	[4]	(408)		(769)
Derivative Assets, Current [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		991	[2]	1,191	[3]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(835)	[2]	(1,049)	[3]
Derivative Assets, Current [Member] | Future [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		727		820
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(727)		(820)
Derivative Assets, Current [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		2		30
Derivative Asset, Collateral, Obligation to Return Cash, Offset		0		0
Derivative Assets, Current [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		262		341
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(108)		(229)
Derivative Assets, Non-current [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		432	[2]	332	[3]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(186)	[2]	(172)	[3]
Derivative Assets, Non-current [Member] | Future [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		145		113
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(145)		(113)
Derivative Assets, Non-current [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		10		10
Derivative Asset, Collateral, Obligation to Return Cash, Offset		0		0
Derivative Assets, Non-current [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		277		209
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(41)		(59)
Derivative Liabilities, Current [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(1,164)	[2]	(1,344)	[3]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		939	[2]	1,041	[3]
Derivative Liabilities, Current [Member] | Future [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(830)		(764)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		830		764
Derivative Liabilities, Current [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(13)		(4)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		0		0
Derivative Liabilities, Current [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(321)		(576)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		109		277
Derivative Liabilities, Non-current [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(259)	[2]	(367)	[3]
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		196	[2]	227	[3]
Derivative Liabilities, Non-current [Member] | Future [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(154)		(168)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		154		168
Derivative Liabilities, Non-current [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(18)		(6)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		0		0
Derivative Liabilities, Non-current [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(87)		(193)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		42		59
Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		1,423		1,523
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(1,021)		(1,221)
Derivative Financial Instruments, Liabilities [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		(1,423)		(1,711)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		$ 1,135		$ 1,268

[1] At December 31, 2019 and 2018, we had $191 million and $244 million of collateral under master netting arrangements that were not offset against our derivative instruments on the Consolidated Balance Sheets primarily related to initial margin requirements.

[2] At December 31, 2019, current and long-term derivative assets are shown net of collateral of $(4) million and $(4) million, respectively, and current and long-term derivative liabilities are shown net of collateral of $108 million and $14 million, respectively.

[3] At December 31, 2018, current and long-term derivative assets are shown net of collateral of $(58) million and $(8) million, respectively, and current and long-term derivative liabilities are shown net of collateral of $49 million and $64 million, respectively.

[4] Includes OTC swaps and options.