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Stockholders' Equity - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2016 USD ($) | Jul. 31, 2015 $ / shares | Mar. 31, 2016 USD ($) vote $ / shares shares | Mar. 31, 2016 USD ($) vote $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Mar. 31, 2014 USD ($) $ / shares shares | Mar. 31, 2013 USD ($)
Dividends Payable [Line Items] |  |  |  |  |  |  |
Number of votes | vote |  |  | 1 | 1 |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  |  |  | $ 1.08 | $ 0.96 | $ 0.92 |
Shares bought | shares |  |  |  | 8.7 | 1.5 | 0.0 |
Shares repurchased |  |  |  | $ 1,504 | $ 340 | $ 0 |
Average price paid per share (in dollars per share) | $ / shares |  |  |  | $ 173.64 | $ 226.55 | $ 0.00 |
Total authorization outstanding for repurchases of common stock |  |  | $ 996 | $ 996 | $ 0 | $ 340 | $ 340
Treasury stock retired (in shares) | shares |  |  |  | 115.5 |  |  |
Retirement of common stock |  |  |  | $ 0 |  |  |
Net foreign currency translation gains (losses) |  |  |  | $ 172 | (1,989) | 83 |
Treasury Stock |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Treasury stock retired (in shares) | shares |  |  |  | 116.0 |  |  |
Retirement of common stock |  |  |  | $ 7,848 |  |  |
Retained Earnings |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Retirement of common stock |  |  |  | 6,354 |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Retirement of common stock |  |  |  | 1,493 |  |  |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Net foreign currency translation gains (losses) |  |  |  | 113 | (1,855) | 53 |
Other comprehensive income (loss) before reclassifications |  |  |  | 113 | (1,845) | $ 9 |
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Net foreign currency translation gains (losses) |  |  |  | 16 | (267) |  |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | $ 4 | $ (12) |  |
Open Market Transactions |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Shares bought | shares |  |  |  | 4.5 |  |  |
Shares repurchased |  |  |  | $ 854 |  |  |
Average price paid per share (in dollars per share) | $ / shares |  |  |  | $ 192.27 |  |  |
Accelerated Share Repurchase |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Shares bought | shares |  |  | 4.2 |  |  |  |
Shares repurchased | $ 650 |  |  |  |  |  |
Average price paid per share (in dollars per share) | $ / shares |  |  | $ 154.04 |  |  |  |
Minimum |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  | $ 0.24 |  |  |  |  |
Maximum |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  | $ 0.28 |  |  |  |  |

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