Accumulated Other Comprehensive Loss, Excluding Noncontrolling Interests Narrative (Detail) (Accum. Other Comp. Loss, USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Accum. Other Comp. Loss
Comprehensive Income (Loss) [Line Items]
Unrealized holding losses on derivative financial instruments	$ 48.0
Actuarial losses related to benefit plan obligations and plan assets and other benefit plan items	195
Prior service credits related primarily to benefit plan amendments	$ 74

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

No definition available.

Name:	us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration