Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Unrealized gain on certain investments, tax	$ (1)	$ 0	$ (2)	$ 0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Unrealized loss arising during period, tax	(20)	36	(13)	51
Reclassification adjustment for losses included in net earnings, tax	3	4	0	3
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax	0	0	0	0
Amortization of prior service cost included in net periodic pension cost, tax	(3)	(2)	(6)	(3)
Net actuarial gains arising during the period, tax	(1)	0	(347)	(16)
Amortization of actuarial losses included in net periodic pension cost, tax	(91)	(216)	(185)	(431)
Settlements and curtailments included in net income, tax	0	0	(113)	(5)
Pension and post retirement benefits related to our equity method investments, tax	$ 0	$ 0	$ 0	$ (1)