Shareholders' Equity (Details 2) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (2,374)
Other comprehensive (loss) income before reclassifications, net	105
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	73
Tax benefit	(22)
Amounts reclassified from accumulated other comprehensive loss, net	51
Net current period other comprehensive (loss) income	156
Ending balance	(2,218)
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	12	[1]
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss	13	[1]
Tax benefit	(4)	[1]
Amounts reclassified from accumulated other comprehensive loss, net	9	[1]
Net current period other comprehensive (loss) income	21	[1]
Ending balance	(1)	[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	92
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	92
Ending balance	261
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	60	[2]
Tax benefit	(18)	[2]
Amounts reclassified from accumulated other comprehensive loss, net	42	[2]
Net current period other comprehensive (loss) income	44	[2]
Ending balance	$ (2,478)	[2]

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

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