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Earnings Per Share, Share Repurchases and Dividends on Common Stock #2 (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended
May 31, 2014
May 31, 2013
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share, Basic and Diluted [Abstract]        
Dilutive effect of of stock awards and options granted to employees under stock-based compensation plans     2.8us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 4.1us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Anti-dilutive stock options excluded from computation of earnings per share     0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Common stock dividends per share, declared (in dollars per share) $ 0.70us-gaap_CommonStockDividendsPerShareDeclared $ 0.61us-gaap_CommonStockDividendsPerShareDeclared $ 0.70us-gaap_CommonStockDividendsPerShareDeclared $ 0.61us-gaap_CommonStockDividendsPerShareDeclared
Increase in quarterly common stock dividend (percent) 15.00%noc_IncreaseDecreaseinStockDividendPercentage