Parent Company Financial Statements (Parent Company Statement of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 2,226us-gaap_ProfitLoss	$ 1,729us-gaap_ProfitLoss	$ 2,028us-gaap_ProfitLoss
OCI, Net of Tax
Change in unrecognized pension and postretirement costs	(323)	411	(111)
Change in unrecognized gains (losses) on cash flow hedges	(56)	175	(14)
Other, net	(1)	(1)	13
Total OCI	(158)	(34)	154
Total comprehensive income	2,068	1,695	2,182
Income Tax Effect Of Items Included In OCI
Change in unrecognized pension and postretirement amounts	(192)	252	(70)
Change in unrecognized gains (losses) on cash flow hedges	(34)	106	(9)
Other, net	2bbt_Othercomprehensiveincomeothernettax	2bbt_Othercomprehensiveincomeothernettax	6bbt_Othercomprehensiveincomeothernettax
Parent Company [Member]
Net income	2,226	1,729	2,028
OCI, Net of Tax
Change in unrecognized pension and postretirement costs	1	(4)	0
Change in unrecognized gains (losses) on cash flow hedges	0	0	(2)
Other, net	2	1	1
Total OCI	3	(3)	(1)
Total comprehensive income	2,229	1,726	2,027
Income Tax Effect Of Items Included In OCI
Change in unrecognized pension and postretirement amounts	0	(1)	0
Change in unrecognized gains (losses) on cash flow hedges	0	0	(1)
Other, net	$ 1	$ 0	$ 0

The increase (decrease) in accumulated comprehensive income during the period related to other, net, after-tax

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Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to other, net

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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