Cash, Cash Equivalents, and Marketable Securities Available for Sale Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Sale Proceeds	$ 69,000,000	$ 1,000,000
Available-for-sale Securities, Gross Realized Gains	1,000,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	0	0
Operating Segments [Member] | Automotive
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,533,000,000	82,000,000
Gross Unrealized Gains	3,000,000	0
Gross Unrealized Losses	(27,000,000)	(12,000,000)
Fair Value	6,509,000,000	70,000,000
Within 1 Year	1,906,000,000	0
After 1 Year through 5 Years	4,415,000,000	70,000,000
After 5 Years through 10 Years	188,000,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,872,000,000	70,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(27,000,000)	(12,000,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,872,000,000	70,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(27,000,000)	(12,000,000)
Operating Segments [Member] | Automotive | U.S. government
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,703,000,000	0
Gross Unrealized Gains	2,000,000	0
Gross Unrealized Losses	(14,000,000)	0
Fair Value	3,691,000,000	0
Within 1 Year	727,000,000	0
After 1 Year through 5 Years	2,776,000,000	0
After 5 Years through 10 Years	188,000,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,474,000,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(14,000,000)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,474,000,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(14,000,000)	0
Operating Segments [Member] | Automotive | U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	308,000,000	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,000,000)	0
Fair Value	306,000,000	0
Within 1 Year	0	0
After 1 Year through 5 Years	306,000,000	0
After 5 Years through 10 Years	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	261,000,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,000,000)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	261,000,000	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2,000,000)	0
Operating Segments [Member] | Automotive | Non-U.S. government and agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,443,000,000	82,000,000
Gross Unrealized Gains	1,000,000	0
Gross Unrealized Losses	(11,000,000)	(12,000,000)
Fair Value	1,433,000,000	70,000,000
Within 1 Year	148,000,000	0
After 1 Year through 5 Years	1,285,000,000	70,000,000
After 5 Years through 10 Years	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,137,000,000	70,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(11,000,000)	(12,000,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,137,000,000	70,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(11,000,000)	(12,000,000)
Operating Segments [Member] | Automotive | Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,079,000,000	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1,079,000,000	0
Within 1 Year	1,031,000,000	0
After 1 Year through 5 Years	48,000,000	0
After 5 Years through 10 Years	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ 0