Shareholders' Equity (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ (3,423)
Amounts reclassified from accumulated other comprehensive loss:
Net current period other comprehensive (loss) income	$ (12)	$ 190	(299)	$ (104)
Ending balance	(3,722)		(3,722)
Change in Fair Value of Financial Instruments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(25)
Other comprehensive (loss) income before reclassifications, net			(14)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss			4
Tax benefit			(1)
Amounts reclassified from accumulated other comprehensive loss, net			3
Net current period other comprehensive (loss) income			(11)
Ending balance	(36)		(36)
Foreign Currency Translation Adjustments [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(771)
Other comprehensive (loss) income before reclassifications, net			(138)
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			(138)
Ending balance	(909)		(909)
Post-Retirement Benefit Obligation [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(2,627)
Other comprehensive (loss) income before reclassifications, net			(234)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss			110
Tax benefit			(26)
Amounts reclassified from accumulated other comprehensive loss, net			84
Net current period other comprehensive (loss) income			(150)
Ending balance	(2,777)		(2,777)
AOCI Attributable to Parent [Member]
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(3,423)
Other comprehensive (loss) income before reclassifications, net			(386)
Amounts reclassified from accumulated other comprehensive loss:
Amounts reclassified from accumulated other comprehensive loss			114
Tax benefit			(27)
Amounts reclassified from accumulated other comprehensive loss, net			87
Net current period other comprehensive (loss) income			(299)
Ending balance	$ (3,722)		$ (3,722)