Shareholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (2,374)
Other comprehensive (loss) income before reclassifications, net	(224)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	111
Tax benefit	(31)
Amounts reclassified from accumulated other comprehensive loss, net	80
Net current period other comprehensive (loss) income	(144)
Ending balance	(2,518)
Change in Fair Value of Investments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	1	[1]
Other comprehensive (loss) income before reclassifications, net	(1)	[1]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	0	[1]
Tax benefit	0	[1]
Amounts reclassified from accumulated other comprehensive loss, net	0	[1]
Net current period other comprehensive (loss) income	(1)	[1]
Ending balance	0	[1]
Change in Fair Value of Derivatives [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(22)	[1]
Other comprehensive (loss) income before reclassifications, net	1	[1]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	17	[1]
Tax benefit	(5)	[1]
Amounts reclassified from accumulated other comprehensive loss, net	12	[1]
Net current period other comprehensive (loss) income	13	[1]
Ending balance	(9)	[1]
Foreign Currency Translation Adjustments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	169
Other comprehensive (loss) income before reclassifications, net	(226)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	0
Tax benefit	0
Amounts reclassified from accumulated other comprehensive loss, net	0
Net current period other comprehensive (loss) income	(226)
Ending balance	(57)
Post-Retirement Benefit Obligation [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2,522)	[2]
Other comprehensive (loss) income before reclassifications, net	2	[2]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	94	[2]
Tax benefit	(26)	[2]
Amounts reclassified from accumulated other comprehensive loss, net	68	[2]
Net current period other comprehensive (loss) income	70	[2]
Ending balance	$ (2,452)	[2]

[1] Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income.

[2] Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Compensation and benefits.