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Debt (Details) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
Debt (Details) $ in Millions	May 05, 2017 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Principal amount
Total debt, excluding debt-related balances			$ 7,475		$ 7,475		$ 8,546
Debt due within one year			872		872		731
Long-term debt			6,603		6,603		7,815
Carrying amount
Total debt			7,390		7,390		8,464
Debt due within one year			865		865		724
Long-term debt			6,525		6,525		7,740
Proceeds from issuance of debt					403
Gain (loss) on retirement of debt			(48)	$ 38	$ (48)	$ 38
Five-Year Revolving Credit Facility
Carrying amount
Borrowing capacity, maximum		$ 3,000
Credit facility term		5 years
Debt to tangible capitalization ratio		0.6
Commitment fee percentage at period end					0.35%
Credit facility amount outstanding			0		$ 0
Letters of credit issued and outstanding			0		0
Credit facility available borrowing capacity			3,000		$ 3,000
Five-Year Revolving Credit Facility \| Adjusted LIBOR
Carrying amount
Spread on variable rate basis (as a percent)					2.00%
Percentage reduction to the calculated variable rate		1.00%
Five-Year Revolving Credit Facility \| Minimum
Carrying amount
Commitment fee percentage at period end		0.15%
Five-Year Revolving Credit Facility \| Minimum \| Adjusted LIBOR
Carrying amount
Spread on variable rate basis (as a percent)		1.125%
Five-Year Revolving Credit Facility \| Maximum
Carrying amount
Commitment fee percentage at period end		0.35%
Five-Year Revolving Credit Facility \| Maximum \| Adjusted LIBOR
Carrying amount
Spread on variable rate basis (as a percent)		2.00%
5.05% Senior Notes due December 2016
Carrying amount
Aggregate principal amount repaid						36
2.5% Senior Notes due October 2017
Principal amount
Total debt, excluding debt-related balances			152		$ 152		485
Debt due within one year			152		152		485
Carrying amount
Total debt			152		152		484
Debt due within one year			$ 152		$ 152		484
Debt instrument interest rate stated percentage			2.50%		2.50%
Interest rate, as adjusted (as a percent)					4.50%
Aggregate principal amount repaid					$ 62	38
Aggregate debt repurchase			$ 271		271
Eksportfinans Loans due January 2018
Principal amount
Total debt, excluding debt-related balances			76		76		123
Debt due within one year			76		76		98
Carrying amount
Total debt			76		76		123
Debt due within one year			76		76		98
6.00% Senior Notes due March 2018
Principal amount
Total debt, excluding debt-related balances			319		319		754
Debt due within one year			319		319
Carrying amount
Total debt			320		320		757
Debt due within one year			$ 320		$ 320
Debt instrument interest rate stated percentage			6.00%		6.00%
Aggregate principal amount repaid					$ 35	20
Aggregate debt repurchase			$ 400		400
7.375% Senior Notes due April 2018
Principal amount
Total debt, excluding debt-related balances			83		83		211
Debt due within one year			83		83
Carrying amount
Total debt			83		83		211
Debt due within one year			$ 83		$ 83
Debt instrument interest rate stated percentage			7.375%		7.375%
Aggregate principal amount repaid					$ 1	26
Aggregate debt repurchase			$ 127		127
6.50% Senior Notes due November 2020
Principal amount
Total debt, excluding debt-related balances			296		296		508
Debt due within one year			4		4
Carrying amount
Total debt			299		299		513
Debt due within one year			$ 4		$ 4
Debt instrument interest rate stated percentage			6.50%		6.50%
Aggregate principal amount repaid					$ 9	13
Aggregate debt repurchase			$ 203		203
6.375% Senior Notes due December 2021
Principal amount
Total debt, excluding debt-related balances			334		334		552
Debt due within one year			2		2
Carrying amount
Total debt			332		332		549
Debt due within one year			$ 2		$ 2
Debt instrument interest rate stated percentage			6.375%		6.375%
Interest rate, as adjusted (as a percent)					8.375%
Aggregate principal amount repaid					$ 7	44
Aggregate debt repurchase			$ 211		211
5.52% Senior Notes due May 2022
Principal amount
Total debt, excluding debt-related balances			410		410
Debt due within one year			87		87
Carrying amount
Total debt			403		403
Debt due within one year			$ 85		$ 85
Debt instrument interest rate stated percentage	5.52%		5.52%		5.52%
Debt instrument face value	$ 410
Proceeds from issuance of debt	$ 403
Redemption price of debt instrument (as a percent)	100.00%
Percentage of principal amount that the holder of the note may require the entity to repurchase upon the occurrence of certain events	100.00%
Aggregate carrying amount assets pledged	$ 105
Aggregate carrying amount assets pledged related to principal	57
Aggregate carrying amount assets pledged related to interest	11
Aggregate carrying amount assets pledged related to working capital	$ 37
3.8% Senior Notes due October 2022
Principal amount
Total debt, excluding debt-related balances			$ 506		$ 506		539
Carrying amount
Total debt			$ 501		$ 501		534
Debt instrument interest rate stated percentage			3.80%		3.80%
Interest rate, as adjusted (as a percent)					5.80%
Aggregate principal amount repaid					$ 33	38
9.00% Senior Notes due July 2023
Principal amount
Total debt, excluding debt-related balances			$ 1,250		1,250		1,250
Carrying amount
Total debt			$ 1,214		$ 1,214		1,211
Debt instrument interest rate stated percentage			9.00%		9.00%
7.75% Senior Secured Notes due October 2024
Principal amount
Total debt, excluding debt-related balances			$ 570		$ 570		600
Debt due within one year			60		60		60
Carrying amount
Total debt			555		555		583
Debt due within one year			$ 57		$ 57		57
Debt instrument interest rate stated percentage			7.75%		7.75%
6.25% Senior Notes due December 2024
Principal amount
Total debt, excluding debt-related balances			$ 594		$ 594		625
Debt due within one year			63		63		63
Carrying amount
Total debt			579		579		609
Debt due within one year			$ 60		$ 60		60
Debt instrument interest rate stated percentage			6.25%		6.25%
7.45% Notes due April 2027
Principal amount
Total debt, excluding debt-related balances			$ 88		$ 88		88
Carrying amount
Total debt			$ 86		$ 86		86
Debt instrument interest rate stated percentage			7.45%		7.45%
Aggregate principal amount repaid						8
8% Debentures due April 2027
Principal amount
Total debt, excluding debt-related balances			$ 57		$ 57		57
Carrying amount
Total debt			$ 57		$ 57		57
Debt instrument interest rate stated percentage			8.00%		8.00%
7.00% Notes due June 2028
Principal amount
Total debt, excluding debt-related balances			$ 300		$ 300		300
Carrying amount
Total debt			$ 308		$ 308		308
Debt instrument interest rate stated percentage			7.00%		7.00%
Capital lease contract due August 2029
Principal amount
Total debt, excluding debt-related balances			$ 552		$ 552		566
Debt due within one year			26		26		25
Carrying amount
Total debt			552		552		566
Debt due within one year			26		26		25
7.5% Notes due April 2031
Principal amount
Total debt, excluding debt-related balances			588		588		588
Carrying amount
Total debt			$ 585		$ 585		585
Debt instrument interest rate stated percentage			7.50%		7.50%
Aggregate principal amount repaid						5
6.80% Senior Notes due March 2038
Principal amount
Total debt, excluding debt-related balances			$ 1,000		$ 1,000		1,000
Carrying amount
Total debt			$ 991		$ 991		991
Debt instrument interest rate stated percentage			6.80%		6.80%
7.35% Senior Notes due December 2041
Principal amount
Total debt, excluding debt-related balances			$ 300		$ 300		300
Carrying amount
Total debt			$ 297		$ 297		$ 297
Debt instrument interest rate stated percentage			7.35%		7.35%
Interest rate, as adjusted (as a percent)					9.35%
Debt Redeemed
Carrying amount
Aggregate principal amount repaid					$ 147	228
Gain (loss) on retirement of debt			$ (1)	$ 38	(1)	38
Aggregate cash payment made for debt redemption					147	$ 189
Tendered Notes
Carrying amount
Gain (loss) on retirement of debt			(47)		(47)
Tender Offer Principal Amount			1,500		1,500
Aggregate debt repurchase			$ 1,212		1,212
Aggregate cash payment made for debt redemption					$ 1,261